The combustion of 0.1584 grams of benzoic acid increases the temperature of a bomb calorimeter by 2.45 (degrees) C. Calculate the heat capacity of this calorimeter. (The energy released by combustion of benzoic acid is 26.42 kJ/g.) A .2130 g sample of vanillin C8H8O3 is then burned in the same calorimeter, and the temperature increases by 3.25 C. What is the energy of combustion per gram of vanillin? Per mole of vanillin?

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Bunny GreenfelderLv2

13 Dec 2019

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Under constant-volume conditions, the heat of combustion of benzoic acid (C₆H₅COOH) is 26.38 kJ/g. A 2.780 g sample of benzoic acid is burned in a bomb calorimeter. The temperature of the calorimeter increases from 21.40°C to 29.98 °C.

a. What is the total heat capacity of the calorimeter?

b. A 1.450 g sample of a new organic substance is combusted in the same calorimeter. The temperature of the calorimeter increases from 22.14 °C to 27.09 °C. What is the heat of combustion per gram of the new substance?

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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 21.60 to 29.93 °C. (a) What is the total heat capacity of the calorimeter? (b) A 1.440-g sample of a new organic substance is combusted in the same calorimeter. The temperature of the calorimeter increases from 22.14 to 27.09 °C. What is the heat of combustion per gram of the new substance? (c) Suppose that in changing samples, a portion of the water in the calorimeter were lost. In what way, if any, would this change the heat capacity of the calorimeter?