Q22Short answer
Standard molar enthalpy of formation, ∆f H is just a special case of enthalpy V V V of reaction, ∆r H . Is the ∆r H for the following reaction same as ∆f H ? Give reason for your answer. V –1 CaO(s) + CO2(g) → CaCO3(s); ∆f H = –178.3 kJ mol V –1
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No, since CaCO3 has been formed from other compounds and not from its constituent elements. V –1