Question

Calculate the standard enthalpy of formation of carbon dioxide (CO2) using the following information:C(graphite) + O2(g) -> CO2(g), ΔH° = -393.5 kJ/molC(graphite) + 2H2(g) -> CH4(g), ΔH° = -74.8 kJ/mol2H2(g) + O2(g) -> 2H2O(l), ΔH° = -572.0 kJ/mol

Answer 1

The standard enthalpy of formation of carbon dioxide  CO2  is already given in the first reaction:C graphite  + O2 g  -> CO2 g , H = -393.5 kJ/molTherefore, the standard enthalpy of formation of CO2 is -393.5 kJ/mol.