Answer to Question #43217 in Physical Chemistry for Sumit
where, H* is standard enthalpy and Delta_f H* means standard enthalpy change of formation.
Delta_f H*(CO2) = H*(CO2) - [H*(C) + H*(O2)]
The standard enthalpy of elementary substance is zero:
H*(C) = H*(O2) = 0
Delta_f H*(CO2) = H*(CO2) - [H*(C) + H*(O2)] = H*(CO2) - [0 + 0] = H*(CO2)
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