At 300K the standard enthalpies of formation of C6H5COOH(s),CO2(g) and H2O(l) are −408,−393 and −286 kJ mol−1 respectively. Calculate the heat of combustion of benzoic acid at constant volume.
A
+3201 kJ
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B
+3199.75 kJ
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C
−3201 kJ
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D
−3199.75 kJ
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Solution
The correct option is B−3199.75 kJ
Heat at constant volume, is equal to the ΔU of the system.