At 300 K, the standard enthalpies of formation of , and are , and respectively. (…

CHEMISTRY · Multi-part · CBSE · Chemistry · Thermodynamics · Thermodynamics

Problem

At 300 K, the standard enthalpies of formation of C6H5COOH(s)\text{C}_6\text{H}_5\text{COOH}(s) , CO2(g)\text{CO}_2(g) and H2O(l)\text{H}_2\text{O}(l) are −408-408 , −393-393 and −286 kJ mol−1-286 \text{ kJ mol}^{-1} respectively. ( R=8.31 J mol−1 K−1R = 8.31 \text{ J mol}^{-1} \text{ K}^{-1} ) (i) Calculate the heat of combustion of benzoic acid at constant pressure. (ii) Calculate the heat of combustion of benzoic acid at constant volume.

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