Hess Law - Calculate the Standard Enthalpy of the Formation (∆H°f) 002
Channel: Professor Heath's Chemistry Channel
Date: 2013-10-21

From the following heats of combustion:
CH3OH (l) + 3/2O2 (g) → CO2 (g) + 2H2O (g) ∆H°rxn = -726.4 kJ/mol
C (graphite) + O2 (g) → CO2 (g) ∆H°rxn = -393.5 kJ/mol
H2 (g) + 1/2O2 (g) → H2O (g) ∆H°rxn = -285.8 kJ/mol
Calculate the standard enthalpy of formation (∆H°f) of methanol (CH3OH) from its elements.
Is this an exothermic or endothermic reaction?