A scientist measures the standard enthalpy change for the following reaction to be - 2925.8 kJ: 2C2H6 (g) + 702(g) → 4CO2 (g) + 6H₂O(g) Based on this value and the standard enthalpies of formation for the other substances, the standard enthalpy of formation of CO2 (g) is kJ/mol. Substance AH (kJ/mol) C₂H6 (g) -84.7 O2(g) 0.0 H₂O(g) -241.8

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