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When 0.1 mole of benzoic acid is burnt with sufficient amount of oxygen the heat released increases the temperature of a specific amount of water by 12 (centigrade degrees).

If the heat capacity of water is 100 (kilo joule)/(centigrade degrees) find the molar heat of combustion of benzoic acid.

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Heat released by combustion of 0.1 mol benzoic acid = 100 kJ/C X 12 C = 1200 kJ

To convert that to kJ/mol: 1200 kJ / 0.1 mol = 1.2X10^3 kJ/mol

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