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Model the kinetic dissolution of 1 mole of Calcite (CaCO3​) in a hydrothermal solution at 100°C, pe of 4 and pH 5, containing 0.5 mmol/kgw of dissolved inorganic carbon and 1 mmol/kgw of Manganese. The simulation should track the reaction over 1000 seconds, broken into 100 discrete time steps. Use a kinetic rate law ba...
C
7
Model the kinetic dissolution of 1 mole of Calcite (CaCO3​) in a hydrothermal solution at 100°C, pe of 4 and pH 5, containing 0.5 mmol/kgw of dissolved inorganic carbon and 1 mmol/kgw of Manganese. The simulation should track the reaction over 1000 seconds, broken into 100 discrete time steps. Use a kinetic rate law ba...
C
9
1 mole of Calcite (CaCO3​) reacts with an acidic pH 2 solution at 200 degrees Celsius. The initial solution contains 10 mmol/kgw of Copper (Cu2+) and 5 mmol/kgw of Barium, with an oxidation potential (pe) of 4. Model the reaction kinetics over a 1000-second duration (using 100 time steps), using a specific surface area...
A
10
1 mole of Calcite (CaCO3​) reacts with an acidic pH 2 solution at 200 degrees Celsius. The initial solution contains 10 mmol/kgw of Copper (Cu2+) and 5 mmol/kgw of Barium, with an oxidation potential (pe) of 4. Model the reaction kinetics over a 1000-second duration (using 100 time steps), using a specific surface area...
C
11
1 mole of Calcite (CaCO3​) reacts with an acidic pH 2 solution at 200 degrees Celsius. The initial solution contains 10 mmol/kgw of Copper (Cu2+) and 5 mmol/kgw of Barium, with an oxidation potential (pe) of 4. Model the reaction kinetics over a 1000-second duration (using 100 time steps), using a specific surface area...
A
12
1 mole of Calcite (CaCO3​) reacts with an acidic pH 2 solution at 200 degrees Celsius. The initial solution contains 10 mmol/kgw of Copper (Cu2+) and 5 mmol/kgw of Barium, with an oxidation potential (pe) of 4. Model the reaction kinetics over a 1000-second duration (using 100 time steps), using a specific surface area...
B
13
1 mole of Calcite (CaCO3​) reacts with an acidic pH 2 solution at 200 degrees Celsius. The initial solution contains 10 mmol/kgw of Copper (Cu2+) and 5 mmol/kgw of Barium, with an oxidation potential (pe) of 4. Model the reaction kinetics over a 1000-second duration (using 100 time steps), using a specific surface area...
C
14
1 mole of Calcite (CaCO3​) reacts with an acidic pH 2 solution at 200 degrees Celsius. The initial solution contains 10 mmol/kgw of Copper (Cu2+) and 5 mmol/kgw of Barium, with an oxidation potential (pe) of 4. Model the reaction kinetics over a 1000-second duration (using 100 time steps), using a specific surface area...
D
15
1 mole of Calcite (CaCO3​) reacts with an acidic pH 2 solution at 200 degrees Celsius. The initial solution contains 10 mmol/kgw of Copper (Cu2+) and 5 mmol/kgw of Barium, with an oxidation potential (pe) of 4. Model the reaction kinetics over a 1000-second duration (using 100 time steps), using a specific surface area...
B
16
1 mole of Calcite (CaCO3​) reacts with an acidic pH 2 solution at 200 degrees Celsius. The initial solution contains 10 mmol/kgw of Copper (Cu2+) and 5 mmol/kgw of Barium, with an oxidation potential (pe) of 4. Model the reaction kinetics over a 1000-second duration (using 100 time steps), using a specific surface area...
B
17
Model the kinetic dissolution of 1 mole of Albite over 1000 seconds (100 time steps) in a pH 2 solution at 200°C containing 4 mmol/kgw Fe+3 and 4mmol/kgw Fe+2 using a specific surface area of 1.0 and a rate constant of 10. Simultaneously, equilibrate the solution with a fixed-pressure gas phase containing 5 atmosphere...
A
18
Model the kinetic dissolution of 1 mole of Albite over 1000 seconds (100 time steps) in a pH 2 solution at 200°C containing 4 mmol/kgw Fe+3 and 4mmol/kgw Fe+2 using a specific surface area of 1.0 and a rate constant of 10. Simultaneously, equilibrate the solution with a fixed-pressure gas phase containing 5 atmosphere...
D
19
Model the kinetic dissolution of 1 mole of Albite over 1000 seconds (100 time steps) in a pH 2 solution at 200°C containing 4 mmol/kgw Fe+3 and 4mmol/kgw Fe+2 using a specific surface area of 1.0 and a rate constant of 10. Simultaneously, equilibrate the solution with a fixed-pressure gas phase containing 5 atmosphere...
C
20
Model the kinetic dissolution of 1 mole of Albite over 1000 seconds (100 time steps) in a pH 2 solution at 200°C containing 4 mmol/kgw Fe+3 and 4mmol/kgw Fe+2 using a specific surface area of 1.0 and a rate constant of 10. Simultaneously, equilibrate the solution with a fixed-pressure gas phase containing 5 atmosphere...
C
21
Model the kinetic dissolution of 1 mole of Albite over 1000 seconds (100 time steps) in a pH 2 solution at 200°C containing 4 mmol/kgw Fe+3 and 4mmol/kgw Fe+2 using a specific surface area of 1.0 and a rate constant of 10. Simultaneously, equilibrate the solution with a fixed-pressure gas phase containing 5 atmosphere...
B
23
Model the kinetic dissolution of 1 mole of Albite over 1000 seconds (100 time steps) in a pH 2 solution at 200°C containing 4 mmol/kgw Fe+3 and 4mmol/kgw Fe+2 using a specific surface area of 1.0 and a rate constant of 10. Simultaneously, equilibrate the solution with a fixed-pressure gas phase containing 5 atmosphere...
D
24
Model the kinetic dissolution of 1 mole of Albite over 1000 seconds (100 time steps) in a pH 2 solution at 200°C containing 4 mmol/kgw Fe+3 and 4mmol/kgw Fe+2 using a specific surface area of 1.0 and a rate constant of 10. Simultaneously, equilibrate the solution with a fixed-pressure gas phase containing 5 atmosphere...
A
25
Model the kinetic dissolution of 1 mole of Albite over 1000 seconds (100 time steps) in a pH 2 solution at 200°C containing 4 mmol/kgw Fe+3 and 4mmol/kgw Fe+2 using a specific surface area of 1.0 and a rate constant of 10. Simultaneously, equilibrate the solution with a fixed-pressure gas phase containing 5 atmosphere...
D
26
Model the kinetic dissolution of 1 mole of Albite over 1000 seconds (100 time steps) in a pH 2 solution at 200°C containing 4 mmol/kgw Fe+3 and 4mmol/kgw Fe+2 using a specific surface area of 1.0 and a rate constant of 10. Simultaneously, equilibrate the solution with a fixed-pressure gas phase containing 5 atmosphere...
A
27
Simulate the mixing of two aqueous solutions in 1:1 proportions: the first containing 50 mmol/kg of dissolved inorganic carbon and the second containing 50 mmol/kg of calcium, as it is heated from 20°C to 200°C in 10 discrete steps, accounting for the precipitation and dissolution of calcite. At 20°C, what is the pH...
A
28
Simulate the mixing of two aqueous solutions in 1:1 proportions: the first containing 50 mmol/kg of dissolved inorganic carbon and the second containing 50 mmol/kg of calcium, as it is heated from 20°C to 200°C in 10 discrete steps, accounting for the precipitation and dissolution of calcite. At 180°C, what is the p...
D
29
Simulate the mixing of two aqueous solutions in 1:1 proportions: the first containing 50 mmol/kg of dissolved inorganic carbon and the second containing 50 mmol/kg of calcium, as it is heated from 20°C to 200°C in 10 discrete steps, accounting for the precipitation and dissolution of calcite. At 200°C, how many mole...
B
30
Simulate the mixing of two aqueous solutions in 1:1 proportions: the first containing 50 mmol/kg of dissolved inorganic carbon and the second containing 50 mmol/kg of calcium, as it is heated from 20°C to 200°C in 10 discrete steps, accounting for the precipitation and dissolution of calcite. At 100°C, how many mole...
D
31
Simulate the mixing of two aqueous solutions in 1:1 proportions: the first containing 50 mmol/kg of dissolved inorganic carbon and the second containing 50 mmol/kg of calcium, as it is heated from 20°C to 200°C in 10 discrete steps, accounting for the precipitation and dissolution of calcite. At 100°C, what is the i...
C
32
Simulate the mixing of two aqueous solutions in 1:1 proportions: the first containing 50 mmol/kg of dissolved inorganic carbon and the second containing 50 mmol/kg of calcium, as it is heated from 20°C to 200°C in 10 discrete steps, accounting for the precipitation and dissolution of calcite. At 160°C, how many spec...
C
33
Simulate the mixing of two aqueous solutions in 1:1 proportions: the first containing 50 mmol/kg of dissolved inorganic carbon and the second containing 50 mmol/kg of calcium, as it is heated from 20°C to 200°C in 10 discrete steps, accounting for the precipitation and dissolution of calcite. At 160°C, what is the s...
A
34
Simulate the mixing of two aqueous solutions in 1:1 proportions: the first containing 50 mmol/kg of dissolved inorganic carbon and the second containing 50 mmol/kg of calcium, as it is heated from 20°C to 200°C in 10 discrete steps, accounting for the precipitation and dissolution of calcite. At 20°C is there more o...
C
35
Simulate the mixing of two aqueous solutions in 1:1 proportions: the first containing 50 mmol/kg of dissolved inorganic carbon and the second containing 50 mmol/kg of calcium, as it is heated from 20°C to 200°C in 10 discrete steps, accounting for the precipitation and dissolution of calcite. At 200°C what is the de...
B
36
Simulate the mixing of two aqueous solutions in 1:1 proportions: the first containing 50 mmol/kg of dissolved inorganic carbon and the second containing 50 mmol/kg of calcium, as it is heated from 20°C to 200°C in 10 discrete steps, accounting for the precipitation and dissolution of calcite. At 200°C what is the lo...
D
38
Simulate the equilibration of a 100°C solution containing 50 mmol/kgw Ca (pH charge-balanced) with a mineral assemblage of Calcite, Gypsum, and Aragonite. Simultaneously equilibrate the system with a 1 atm gas phase (at 25°C) composed of CO2 at partial pressure 1 atm, CH4 at partial pressure 5 atm, and H2S at partial p...
B
39
Simulate the equilibration of a 100°C solution containing 50 mmol/kgw Ca (pH charge-balanced) with a mineral assemblage of Calcite, Gypsum, and Aragonite. Simultaneously equilibrate the system with a 1 atm gas phase (at 25°C) composed of CO2 at partial pressure 1 atm, CH4 at partial pressure 5 atm, and H2S at partial p...
A
40
Simulate the equilibration of a 100°C solution containing 50 mmol/kgw Ca (pH charge-balanced) with a mineral assemblage of Calcite, Gypsum, and Aragonite. Simultaneously equilibrate the system with a 1 atm gas phase (at 25°C) composed of CO2 at partial pressure 1 atm, CH4 at partial pressure 5 atm, and H2S at partial p...
B
41
Simulate the equilibration of a 100°C solution containing 50 mmol/kgw Ca (pH charge-balanced) with a mineral assemblage of Calcite, Gypsum, and Aragonite. Simultaneously equilibrate the system with a 1 atm gas phase (at 25°C) composed of CO2 at partial pressure 1 atm, CH4 at partial pressure 5 atm, and H2S at partial p...
A
42
Simulate the equilibration of a 100°C solution containing 50 mmol/kgw Ca (pH charge-balanced) with a mineral assemblage of Calcite, Gypsum, and Aragonite. Simultaneously equilibrate the system with a 1 atm gas phase (at 25°C) composed of CO2 at partial pressure 1 atm, CH4 at partial pressure 5 atm, and H2S at partial p...
B
43
Simulate the equilibration of a 100°C solution containing 50 mmol/kgw Ca (pH charge-balanced) with a mineral assemblage of Calcite, Gypsum, and Aragonite. Simultaneously equilibrate the system with a 1 atm gas phase (at 25°C) composed of CO2 at partial pressure 1 atm, CH4 at partial pressure 5 atm, and H2S at partial p...
A
44
Simulate the equilibration of a 100°C solution containing 50 mmol/kgw Ca (pH charge-balanced) with a mineral assemblage of Calcite, Gypsum, and Aragonite. Simultaneously equilibrate the system with a 1 atm gas phase (at 25°C) composed of CO2 at partial pressure 1 atm, CH4 at partial pressure 5 atm, and H2S at partial p...
D
45
Simulate the equilibration of a 100°C solution containing 50 mmol/kgw Ca (pH charge-balanced) with a mineral assemblage of Calcite, Gypsum, and Aragonite. Simultaneously equilibrate the system with a 1 atm gas phase (at 25°C) composed of CO2 at partial pressure 1 atm, CH4 at partial pressure 5 atm, and H2S at partial p...
B
46
Simulate the equilibration of a 100°C solution containing 50 mmol/kgw Ca (pH charge-balanced) with a mineral assemblage of Calcite, Gypsum, and Aragonite. Simultaneously equilibrate the system with a 1 atm gas phase (at 25°C) composed of CO2 at partial pressure 1 atm, CH4 at partial pressure 5 atm, and H2S at partial p...
A
47
Simulate a 100°C pure water solution at pH 3 at equilibrium with 10 moles each of K-mica, Kaolinite, Dolomite, Epsomite, Amorphous Ferric Hydroxide [Fe(OH)3(a)], and Halite. What is the pH of the solution? A. 5.506 B. 5.509 C. 5.507 D. 5.508
B
49
Simulate a 100°C pure water solution at pH 3 at equilibrium with 10 moles each of K-mica, Kaolinite, Dolomite, Epsomite, Amorphous Ferric Hydroxide [Fe(OH)3(a)], and Halite. What is the specific conductance of the solution? A. 124109 B. 124104 C. 124108 D. 124103
C
50
Simulate a 100°C pure water solution at pH 3 at equilibrium with 10 moles each of K-mica, Kaolinite, Dolomite, Epsomite, Amorphous Ferric Hydroxide [Fe(OH)3(a)], and Halite. What is the molality of Al (OH) 4- in the solution? A. 2.243e-06 B. 2.242e-06 C. 2.241e-06 D. 2.240e-06
B
51
Simulate a 100°C pure water solution at pH 3 at equilibrium with 10 moles each of K-mica, Kaolinite, Dolomite, Epsomite, Amorphous Ferric Hydroxide [Fe(OH)3(a)], and Halite. Is there more moles of Fe (2) or Fe (3) in solution? A. Fe (2) B. Fe (3) C. Same D. N/A
B
52
Simulate a 100°C pure water solution at pH 3 at equilibrium with 10 moles each of K-mica, Kaolinite, Dolomite, Epsomite, Amorphous Ferric Hydroxide [Fe(OH)3(a)], and Halite. Are there fewer species of Fe (2) or Fe (3) in solution? A. Fe (2) B. Fe (3) C. same D. n/a
A
53
Simulate a 100°C pure water solution at pH 3 at equilibrium with 10 moles each of K-mica, Kaolinite, Dolomite, Epsomite, Amorphous Ferric Hydroxide [Fe(OH)3(a)], and Halite. How many species of Al are in solution? A. 5 B. 6 C. 8 D. 4
C
55
Simulate a 100°C pure water solution at pH 3 at equilibrium with 10 moles each of K-mica, Kaolinite, Dolomite, Epsomite, Amorphous Ferric Hydroxide [Fe(OH)3(a)], and Halite. What is the saturation index of Mirabilite? A. -1.92 B. -1.89 C. -1.91 D. -1.90
D
57
Simulate the geochemical equilibration of 1 kg of a 100°C aqueous solution at pH 5 containing 100 mmol/kgw of dissolved Barium at equilibrium with a mineral assemblage consisting of 10 moles each of Talc, Rhodochrosite, Sepiolite (including the disordered form), and Lead Hydroxide [Pb(OH)2​]. What is the pH? A. 7...
A
58
Simulate the geochemical equilibration of 1 kg of a 100°C aqueous solution at pH 5 containing 100 mmol/kgw of dissolved Barium at equilibrium with a mineral assemblage consisting of 10 moles each of Talc, Rhodochrosite, Sepiolite (including the disordered form), and Lead Hydroxide [Pb(OH)2​]. What is the specific co...
D
59
Simulate the geochemical equilibration of 1 kg of a 100°C aqueous solution at pH 5 containing 100 mmol/kgw of dissolved Barium at equilibrium with a mineral assemblage consisting of 10 moles each of Talc, Rhodochrosite, Sepiolite (including the disordered form), and Lead Hydroxide [Pb(OH)2​]. What is the ionic stren...
B
60
Simulate the geochemical equilibration of 1 kg of a 100°C aqueous solution at pH 5 containing 100 mmol/kgw of dissolved Barium at equilibrium with a mineral assemblage consisting of 10 moles each of Talc, Rhodochrosite, Sepiolite (including the disordered form), and Lead Hydroxide [Pb(OH)2​]. Which mineral dissolved...
B
61
Simulate the geochemical equilibration of 1 kg of a 100°C aqueous solution at pH 5 containing 100 mmol/kgw of dissolved Barium at equilibrium with a mineral assemblage consisting of 10 moles each of Talc, Rhodochrosite, Sepiolite (including the disordered form), and Lead Hydroxide [Pb(OH)2​]. Which mineral had net p...
A
62
Simulate the geochemical equilibration of 1 kg of a 100°C aqueous solution at pH 5 containing 100 mmol/kgw of dissolved Barium at equilibrium with a mineral assemblage consisting of 10 moles each of Talc, Rhodochrosite, Sepiolite (including the disordered form), and Lead Hydroxide [Pb(OH)2​]. How many moles of talc ...
D
63
Simulate the geochemical equilibration of 1 kg of a 100°C aqueous solution at pH 5 containing 100 mmol/kgw of dissolved Barium at equilibrium with a mineral assemblage consisting of 10 moles each of Talc, Rhodochrosite, Sepiolite (including the disordered form), and Lead Hydroxide [Pb(OH)2​]. How many species of C (...
B
65
Simulate the geochemical equilibration of 1 kg of a 100°C aqueous solution at pH 5 containing 100 mmol/kgw of dissolved Barium at equilibrium with a mineral assemblage consisting of 10 moles each of Talc, Rhodochrosite, Sepiolite (including the disordered form), and Lead Hydroxide [Pb(OH)2​]. What is the saturation ...
C
67
Simulate the equilibrium oxidation of Pyrite in 1 kg of pure water at 25°C. The system starts at a neutral pH (7.0) and is exposed to a constant atmospheric oxygen source (log PO2​​=−0.7). Allow up to 0.1 moles of Pyrite to react and the potential precipitation of Goethite and Gypsum. What is the pH? A. 0.944 B....
C
68
Simulate the equilibrium oxidation of Pyrite in 1 kg of pure water at 25°C. The system starts at a neutral pH (7.0) and is exposed to a constant atmospheric oxygen source (log PO2​​=−0.7). Allow up to 0.1 moles of Pyrite to react and the potential precipitation of Goethite and Gypsum. What is the saturation index of...
B
69
Simulate the equilibrium oxidation of Pyrite in 1 kg of pure water at 25°C. The system starts at a neutral pH (7.0) and is exposed to a constant atmospheric oxygen source (log PO2​​=−0.7). Allow up to 0.1 moles of Pyrite to react and the potential precipitation of Goethite and Gypsum. What is the pe of the solution?...
A
70
Simulate the equilibrium oxidation of Pyrite in 1 kg of pure water at 25°C. The system starts at a neutral pH (7.0) and is exposed to a constant atmospheric oxygen source (log PO2​​=−0.7). Allow up to 0.1 moles of Pyrite to react and the potential precipitation of Goethite and Gypsum. What is the specific conductanc...
C
71
Simulate the equilibrium oxidation of Pyrite in 1 kg of pure water at 25°C. The system starts at a neutral pH (7.0) and is exposed to a constant atmospheric oxygen source (log PO2​​=−0.7). Allow up to 0.1 moles of Pyrite to react and the potential precipitation of Goethite and Gypsum. What is the alkalinity? A. -...
A
72
Simulate the equilibrium oxidation of Pyrite in 1 kg of pure water at 25°C. The system starts at a neutral pH (7.0) and is exposed to a constant atmospheric oxygen source (log PO2​​=−0.7). Allow up to 0.1 moles of Pyrite to react and the potential precipitation of Goethite and Gypsum. How many species of Fe (3) are ...
A
73
Simulate the equilibrium oxidation of Pyrite in 1 kg of pure water at 25°C. The system starts at a neutral pH (7.0) and is exposed to a constant atmospheric oxygen source (log PO2​​=−0.7). Allow up to 0.1 moles of Pyrite to react and the potential precipitation of Goethite and Gypsum. What is the saturation index of...
D
74
Simulate the equilibrium oxidation of Pyrite in 1 kg of pure water at 25°C. The system starts at a neutral pH (7.0) and is exposed to a constant atmospheric oxygen source (log PO2​​=−0.7). Allow up to 0.1 moles of Pyrite to react and the potential precipitation of Goethite and Gypsum. What is the molality of H+ in t...
A
75
Simulate the equilibrium oxidation of Pyrite in 1 kg of pure water at 25°C. The system starts at a neutral pH (7.0) and is exposed to a constant atmospheric oxygen source (log PO2​​=−0.7). Allow up to 0.1 moles of Pyrite to react and the potential precipitation of Goethite and Gypsum. What is the molality of S (6) i...
B
76
Simulate the equilibrium oxidation of Pyrite in 1 kg of pure water at 25°C. The system starts at a neutral pH (7.0) and is exposed to a constant atmospheric oxygen source (log PO2​​=−0.7). Allow up to 0.1 moles of Pyrite to react and the potential precipitation of Goethite and Gypsum. Are there more moles of Fe (2) ...
B
77
Simulate the equilibration of 1 kg of pure water at 150°C (neutral pH 7, pe 4) with a fixed-pressure gas phase. The gas phase is also maintained at 150°C and a total pressure of 1 atm, consisting of a mixture of 10 moles of Methane (CH4​), 10 moles of Carbon Dioxide (CO2​), and 5 moles of Ammonia (NH3​). What is the...
D
79
Simulate the equilibration of 1 kg of pure water at 150°C (neutral pH 7, pe 4) with a fixed-pressure gas phase. The gas phase is also maintained at 150°C and a total pressure of 1 atm, consisting of a mixture of 10 moles of Methane (CH4​), 10 moles of Carbon Dioxide (CO2​), and 5 moles of Ammonia (NH3​). What is the...
C
80
Simulate the equilibration of 1 kg of pure water at 150°C (neutral pH 7, pe 4) with a fixed-pressure gas phase. The gas phase is also maintained at 150°C and a total pressure of 1 atm, consisting of a mixture of 10 moles of Methane (CH4​), 10 moles of Carbon Dioxide (CO2​), and 5 moles of Ammonia (NH3​). How many sp...
A
81
Simulate the equilibration of 1 kg of pure water at 150°C (neutral pH 7, pe 4) with a fixed-pressure gas phase. The gas phase is also maintained at 150°C and a total pressure of 1 atm, consisting of a mixture of 10 moles of Methane (CH4​), 10 moles of Carbon Dioxide (CO2​), and 5 moles of Ammonia (NH3​). Is the mola...
A
82
Simulate the equilibration of 1 kg of pure water at 150°C (neutral pH 7, pe 4) with a fixed-pressure gas phase. The gas phase is also maintained at 150°C and a total pressure of 1 atm, consisting of a mixture of 10 moles of Methane (CH4​), 10 moles of Carbon Dioxide (CO2​), and 5 moles of Ammonia (NH3​). What is the...
B
83
Simulate the equilibration of 1 kg of pure water at 150°C (neutral pH 7, pe 4) with a fixed-pressure gas phase. The gas phase is also maintained at 150°C and a total pressure of 1 atm, consisting of a mixture of 10 moles of Methane (CH4​), 10 moles of Carbon Dioxide (CO2​), and 5 moles of Ammonia (NH3​). What is the...
D
84
Simulate the equilibration of 1 kg of pure water at 150°C (neutral pH 7, pe 4) with a fixed-pressure gas phase. The gas phase is also maintained at 150°C and a total pressure of 1 atm, consisting of a mixture of 10 moles of Methane (CH4​), 10 moles of Carbon Dioxide (CO2​), and 5 moles of Ammonia (NH3​). What is the...
A
85
Simulate the equilibration of 1 kg of pure water at 150°C (neutral pH 7, pe 4) with a fixed-pressure gas phase. The gas phase is also maintained at 150°C and a total pressure of 1 atm, consisting of a mixture of 10 moles of Methane (CH4​), 10 moles of Carbon Dioxide (CO2​), and 5 moles of Ammonia (NH3​). What was th...
B
86
Simulate the equilibration of 1 kg of pure water at 150°C (neutral pH 7, pe 4) with a fixed-pressure gas phase. The gas phase is also maintained at 150°C and a total pressure of 1 atm, consisting of a mixture of 10 moles of Methane (CH4​), 10 moles of Carbon Dioxide (CO2​), and 5 moles of Ammonia (NH3​). What is the...
D
87
Simulate a solution of pure water at pH 7 and 150°C at equilibrium with 10 moles of chrysotile and 10 moles of talc. What is the pH? A. 7.493 B. 7.494 C. 7.491 D. 7.492
D
88
Simulate a solution of pure water at pH 7 and 150°C at equilibrium with 10 moles of chrysotile and 10 moles of talc. What is the specific conductance? A. 44 B. 46 C. 47 D. 48
B
89
Simulate a solution of pure water at pH 7 and 150°C at equilibrium with 10 moles of chrysotile and 10 moles of talc. What is the pe? A. 3.506 B. 3.509 C. 3.504 D. 3.508
D
90
Simulate a solution of pure water at pH 7 and 150°C at equilibrium with 10 moles of chrysotile and 10 moles of talc. What is the ionic strength? A. 8.538e-05 B. 8.539e-05 C. 8.537e-05 D. 8.536e-05
A
91
Simulate a solution of pure water at pH 7 and 150°C at equilibrium with 10 moles of chrysotile and 10 moles of talc. What is the log IAP of Chrysotile? A. 21.13 B. 21.15 C. 21.14 D. 21.18
C
92
Simulate a solution of pure water at pH 7 and 150°C at equilibrium with 10 moles of chrysotile and 10 moles of talc. How many species of Si are present? A. 1 B. 2 C. 3 D. 5
C
93
Simulate a solution of pure water at pH 7 and 150°C at equilibrium with 10 moles of chrysotile and 10 moles of talc. What is the saturation index of Chalcedony? A. -2.33 B. -2.37 C. -2.30 D. -2.36
D
94
Simulate a solution of pure water at pH 7 and 150°C at equilibrium with 10 moles of chrysotile and 10 moles of talc. What is the saturation index of quartz? A. -2.20 B. -2.24 C. -2.21 D. -2.28
C
95
Simulate a solution of pure water at pH 7 and 150°C at equilibrium with 10 moles of chrysotile and 10 moles of talc. What is the molality of MgOH+? A. 6.818e-06 B. 6.814e-06 C. 6.816e-06 D. 6.817e-06
C
96
Simulate a solution of pure water at pH 7 and 150°C at equilibrium with 10 moles of chrysotile and 10 moles of talc. Is there more Mg or Si in solution? A. Mg B. Si C. Same D. N/A
A
97
Create a solution at 25 degrees C, pH 7.5, 100 mg/L Ca, and 250 mg/L Alkalinity as CaCO3. What is the molality of Alkalinity? A. 4.995e-03 B. 4.993e-03 C. 4.997e-03 D. 4.999e-03
C
98
Create a solution at 25 degrees C, pH 7.5, 100 mg/L Ca, and 250 mg/L Alkalinity as CaCO3. What is the molality of Ca? A. 2.496e-03 B. 2.498e-03 C. 2.495e-03 D. 2.494e-03
A
99
Create a solution at 25 degrees C, pH 7.5, 100 mg/L Ca, and 250 mg/L Alkalinity as CaCO3. What is the total carbon? A. 5.280e-03 B. 5.284e-03 C. 5.285e-03 D. 5.287e-03
D
100
Create a solution at 25 degrees C, pH 7.5, 100 mg/L Ca, and 250 mg/L Alkalinity as CaCO3. What is the electrical balance? A. -5.431e-06 B. -5.435e-06 C. -5.436e-06 D. -5.438e-06
A
101
Create a solution at 25 degrees C, pH 7.5, 100 mg/L Ca, and 250 mg/L Alkalinity as CaCO3. What is the specific conductance? A. 464 B. 468 C. 473 D. 463
D
102
Create a solution at 25 degrees C, pH 7.5, 100 mg/L Ca, and 250 mg/L Alkalinity as CaCO3. What is the saturation index of Aragonite? A. 0.40 B. 0.39 C. 0.42 D. 0.41
A
103
Create a solution at 25 degrees C, pH 7.5, 100 mg/L Ca, and 250 mg/L Alkalinity as CaCO3. What is the saturation index of O2 (g)? A. -37.20 B. -37.18 C. -37.19 D. -37.21
C
104
Create a solution at 25 degrees C, pH 7.5, 100 mg/L Ca, and 250 mg/L Alkalinity as CaCO3. What is the activity of CO2? A. 3.193e-04 B. 3.199e-04 C. 3.198e-04 D. 3.197e-04
D
105
Create a solution at 25 degrees C, pH 7.5, 100 mg/L Ca, and 250 mg/L Alkalinity as CaCO3. What is the activity of H2? A. 7.079e-27 B. 7.070e-27 C. 7.073e-27 D. 7.075e-27
A
106
Create a solution of river water, pH 6.0 and Cl 10, and seawater. pH 8.1 and Cl 19000. Mix them at a 0.7:0.3 ratio. What is the molality of Cl? A. 5.707e+00 B. 5.710e+00 C. 5.709e+00 D. 5.708e+00
A
107
Create a solution of river water, pH 6.0 and Cl 10, and seawater. pH 8.1 and Cl 19000. Mix them at a 0.7:0.3 ratio. What is the pH of the mixture? A. 6.732 B. 6.730 C. 6.733 D. 6.731
C
109
Create a solution of river water, pH 6.0 and Cl 10, and seawater. pH 8.1 and Cl 19000. Mix them at a 0.7:0.3 ratio. what is the electrical balance? A. -5.703e+00 B. -5.707e+00 C. -5.709e+00 D. -5.710e+00
B
110
Create a solution of river water, pH 6.0 and Cl 10, and seawater. pH 8.1 and Cl 19000. Mix them at a 0.7:0.3 ratio. What is the viscosity of the mixture? A. 0.89229 B. 0.89829 C. 0.89429 D. 0.89329
D
111
Create a solution of river water, pH 6.0 and Cl 10, and seawater. pH 8.1 and Cl 19000. Mix them at a 0.7:0.3 ratio. What is the specific conductance of the mixture? A. 263753 B. 263768 C. 263761 D. 263760
D
112
Create a solution of river water, pH 6.0 and Cl 10, and seawater. pH 8.1 and Cl 19000. Mix them at a 0.7:0.3 ratio. What is the saturation index of H2O (g)? A. -1.55 B. -1.51 C. -1.54 D. -1.53
A
113
Create a solution of river water, pH 6.0 and Cl 10, and seawater. pH 8.1 and Cl 19000. Mix them at a 0.7:0.3 ratio. What is the activity of H+ in the mixture? A. 1.850e-07 B. 1.852e-07 C. 1.851e-07 D. 1.855e-07
C
114
Create a solution of river water, pH 6.0 and Cl 10, and seawater. pH 8.1 and Cl 19000. Mix them at a 0.7:0.3 ratio. What is the molality of HCl? A. 1.286e-08 B. 1.285e-08 C. 1.283e-08 D. 1.280e-08
A
116
Create an initial solution of pure water at pH 7.0 Add in steps .001, 0.005, 0.01, 0.05 , and 0.1 moles of sulfuric acid. What is the pH of the final solution? A. 1.013 B. 1.010 C. 1.019 D. 1.018
A
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PHREEQC-MCQ: verified items and model predictions

Four-option multiple-choice items that require running PHREEQC, a geochemistry simulator from the USGS, together with every per-item model prediction from Same Simulation, Different Evidence: Where Retrieved Tool Output Costs LLM Agents Accuracy.

The items come from PHREEQC-MCQ-200. This release contains the 158 items whose answer keys were reproduced by re-executing PHREEQC 3.8.6; all main-text results of the paper use these items.

The agent harness, the frozen PHREEQC database, and full agent trajectories are on GitHub: grenadeComing/same-simulation-different-evidence.

Load

from datasets import load_dataset

items = load_dataset("grenadeComing/same-simulation-different-evidence", "items", split="test")
predictions = load_dataset("grenadeComing/same-simulation-different-evidence", "predictions", split="test")

Fields

items (158 rows)

Field Meaning
id Item id (numbering of the original 200-item pool)
question The prompt given to models, options included
answer Correct option letter

predictions (8,851 rows: one per run and item)

Field Meaning
run Run directory under result/ in the GitHub repository
model Model
setting agent, no_tools, or paired_replay
condition Raw100k, TOC, Grep, Hybrid, TOC+Report, TOC+Round, Direct, or CoT
repeat Repeat index (paired replay only)
item_id Item id, matching items.id
prediction Predicted option letter; null when the agent gave no answer
answer Correct option letter
correct Whether the prediction is correct; missing answers count as incorrect

Conditions: Raw100k returns the simulator report inline, truncated to 100k characters; TOC returns an index of report sections that the agent reads by line range; Grep gives the agent a regular-expression search tool; Hybrid returns the report inline when it fits and the TOC otherwise; TOC+Report and TOC+Round add an instruction to answer from the report or to round to the options' precision; Direct and CoT use no tools.

Rows are stored per run, and several conditions have more than one run. The TOC results on the 33 long-output items come from the custom/pool200_tocfix_uncapped_capaffected45_* runs, which replace the TOC reruns on those items; the run map in the GitHub README lists every run.

Citation

@article{zhang2026samesimulation,
  title   = {Same Simulation, Different Evidence: Where Retrieved Tool Output Costs {LLM} Agents Accuracy},
  author  = {Zhang, Ke and Chundur, Sahchit and Owusu, Jerry Peprah and Abdolhosseini Qomi, Mohammad Javad and Raissi, Maziar},
  journal = {arXiv preprint arXiv:2610.26836},
  year    = {2026}
}

@article{zhang2026phreeqcmcq,
  title   = {{PHREEQC-MCQ-200}: A Diagnostic Benchmark for Tool-Augmented Scientific Simulator Agents},
  author  = {Zhang, Ke and Chundur, Sahchit and Abdolhosseini Qomi, Mohammad Javad and Raissi, Maziar},
  journal = {arXiv preprint arXiv:2607.00436},
  year    = {2026}
}

License

The items are released under CC BY 4.0. Model predictions are outputs of the evaluated models; their use is also subject to each provider's terms.

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