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  • Standard molar enthalpy of formation, \Delta _{f}H^{\ominus } is just a special case of enthalpy of reaction, \Delta _{r}H^{\ominus } . Is the \Delta _{r}H^{\ominus } for the following reaction same as \Delta _{r}H^{\ominus } ?

Standard molar enthalpy of formation, \Delta _{f}H^{\ominus } is just a special case of enthalpy of reaction, \Delta _{r}H^{\ominus } . Is the \Delta _{r}H^{\ominus }  for the following reaction same as \Delta _{f}H^{\ominus } ? Give a reason for your answer.
CaO(s) + CO_{2}(g) \rightarrow CaCO_{3}(s); \Delta _{f}H^{\ominus }=-178.3\; kJ mol^{-1}

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No, since CaCO3 has been formed from other compounds and not from its constituent elements.

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infoexpert22

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