(i) What is enthalpy change at constant volume? Explain.
(ii) Calculate the enthalpy of transition for carbon from the following data given:
C_diamond + O₂ ? CO₂(g); ?H = – 943 kcal
C_amorphous + O₂ ? CO₂(g); ?H = – 97-6 kcal
Also, calculate the heat required to change 1 g of C_diamond to C_amorphous.

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