Problem: Under constant-volume conditions the heat of combustion of benzoic acid (C6H5COOH) is 26.38 kJ/g. A 2.760 -g sample of benzoic acid is burned in a bomb calorimeter. The temperature of the calorimeter increases from 21.50 oC to 29.95 oC.A 1.460 g sample of a new organic substance is combusted in the same calorimeter. The temperature of the calorimeter increases from 22.14 oC to 27.09 oC. What is the heat of combustion per gram of the new substance?

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Calculating heat released

heat released = 2.760 g (26.38 kJg) heat released =72.81 kJ

Calculating the heat capacity of the calorimeter

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Problem Details

Under constant-volume conditions the heat of combustion of benzoic acid (C6H5COOH) is 26.38 kJ/g. A 2.760 -g sample of benzoic acid is burned in a bomb calorimeter. The temperature of the calorimeter increases from 21.50 oC to 29.95 oC.

A 1.460 g sample of a new organic substance is combusted in the same calorimeter. The temperature of the calorimeter increases from 22.14 oC to 27.09 oC. What is the heat of combustion per gram of the new substance?

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