A scientist measures the standard enthalpy change for the following reaction to be –2913.8 kJ:
2 C2H6(g) + 7 O2(g) à 4 CO2(g) + 6 H2O(g)
Based on this value and the standard enthalpies of formation for the other substances, the
standard enthalpy of formation of CO2(g) would be:
Compound
ΔHo (kJ/mol)
C2H6(g)
−84.7
H2O(g)
−241.8