Spreadsheet: 1b4fc871-491f-45b4-b3e8-0999d4b4daad
Sheet: Sheet1

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 |  |  |  |  |  |  |  |  |  | LHV | HHV | Units
 |  |  |  |  |  |  |  |  |  | 816.8965099999999 | 905.0685699999999 | kJ/g-mol
 |  |  |  |  |  |  |  |  |  | 195.2429517208413 | 216.3165798279158 | kcal/g-mol
 |  |  |  |  |  |  |  |  |  | 351437.86446361 | 389370.45456827 | Btu/lb-mol
 |  |  |  | Natural Gas Properties |  |  |  |  |  | 47489.42746771387 | 52615.21830754609 | kJ/kg
 |  |  | Species | Mol. mass | Vol % | Mass % | Mass, g | DH°comb |  | 11350.24557067731 | 12575.33898363912 | kcal/kg
 |  | Methane | CH4 | 16.043 | 0.941 | 0.8776171471922753 | 15.096463 | -754.989707 |  | 20430.47408031265 | 22635.64568330771 | Btu/lb
 |  | [NAME] | C2H4 | 28.054 | 0.005 | 0.008154450299825892 | 0.14027 | -6.615565 |  | 13.19150762992052 | 14.6153384187628 | kwh/kg
 |  | [NAME] | [NAME] | 30.07 | 0.016 | 0.02796940991125852 | 0.48112 | -22.844416 |  | 36445.8155617025 | 40379.60961898813 | kJ/scm
 |  | Propane | C3H8 | 44.097 | 0.009 | 0.02307179834492622 | 0.396873 | -18.395424 |  | 8710.758977462358 | 9650.95832193789 | kcal/scm |  |  |  | References
 |  | Butanes & higher | C4H10 + | 58.124 | 0.005 | 0.01689489089709418 | 0.29062 | -13.28479 |  | 35969.20038747743 | 39851.5507903659 | kJ/scm |  |  |  | 1.  Wikipedia contributors, "Heat of combustion", "Standard enthalpy of formation", Wikipedia, the Free Encyclopedia, July 2012, http://
 |  | Hydrogen | H2 | 2.016 | 0.002 | 0.0002343961189769587 | 0.004032 | -0.483628 |  | 8596.84521689231 | 9524.749232879038 | kcal/scm |  |  |  | 2.  Fact-Web programs, http://www.crct.polymtl.ca/factweb.php.  Use Reaction-Web.
 |  | Carbon monoxide | CO | 28.011 | 0.001 | 0.001628390299767755 | 0.028011 | -0.28298 |  | 926.1037853473437 | 1026.063177422446 | Btu/scf | STP = 1 atm & 60 °F |  |  | 3.  NIST Chemistry WebBook, http://webbook.nist.gov/chemistry/
 |  | Carbon dioxide | CO2 | 44.011 | 0.011 | 0.02814386991945541 | 0.4841209999999999 | 0 |  |  |  |  |  |  |  | 4.  Thermart Software, http://www.thermart.net/
 |  | Nitrogen (by diff.) | N2 | 28.014 | 0.01000000000000001 | 0.01628564701641996 | 0.2801400000000002 | 0 |  | Element Balance
 |  |  |  |  |  |  |  |  |  |  | moles | mass
 |  |  | Molecular mass of NG | 17.20164999999999 |  |  | DH°comb, kJ/g-mol NG | -816.8965099999999 |  | C | 1.042 | 12.51442
 |  |  |  |  |  |  |  |  |  | H | 4.005999999999999 | 4.037847699999999
 |  |  |  |  |  |  | moles | mass |  | O | 0.023 | 0.368
 |  |  |  |  |  | CO2 produced by combustion | 1.031 | 28.87831 |  | N | 0.02000000000000002 | 0.2801400000000002
 |  |  |  |  |  | H2O produced by combustion | 2.003 | 36.08604799999999
 |  |  |  |  |  | O2 required for combustion | 2.0325 | 65.03999999999999
 |  |  |  | Table I. Molar DH°formation at 25 °C |  |  |  | Table II. Molar DH°reax at 25 °C
 |  |  |  | kJ/g-mol |  |  | Reaction to form H2O(g) |  |  | kJ/g-mol
 |  |  | CH4 | -74.81 |  | 2O2 + CH4 → CO2 + 2H2O(g) |  |  |  | -802.327
 |  |  | C2H4 | 52.467 |  | 3O2 + C2H4 → 2CO2 + 2H2O(g) |  |  |  | -1323.113
 |  |  | [NAME] | -84.684 |  | 3½O2 + C2H6 → 2CO2 + 3H2O(g) |  |  |  | -1427.776
 |  | NG constituents | C3H8 | -103.847 |  | 5O2 + C3H8 → 3CO2 + 4H2O(g) |  |  |  | -2043.936
 |  |  | C4H10 | -126.148 |  | 6½O2 + C4H10 → 4CO2 + 5H2O(g) |  |  |  | -2656.958
 |  |  | H2 | 0 |  | [NAME] → H2O(g) |  |  |  | -241.814
 |  |  | CO | -110.529 |  | [NAME] |  |  |  | -282.98
 |  |  | CO2 | -393.509 |  | Reaction to condense water vapor
 |  | Combustion products | H2O(g) | -241.814 |  | H2O(g) → H2O(liq) |  |  |  | -44.02
 |  |  | H2O(liq) | -285.83