A 0.2170 g sample of vanillin (C8H8O3) is then burned in the same calorimeter, and the temperature increases b

Question

The combustion of 0.1571 g benzoic acid increases the temperature of a bomb calorimeter by 2.67°C. Calculate the heat capacity of this calorimeter. (The energy released by combustion of benzoic acid is 26.42 kJ/g.)?

A 0.2170 g sample of vanillin (C8H8O3) is then burned in the same calorimeter, and the temperature increases by 3.29°C. What is the energy of combustion per gram of vanillin?

Answer 1

The heat capacity of the calorimeter:
(26.42 kJ/g)*(0.1571 g)/(2.67°C) = 1.55 kJ/°C

The energy of combustion per gram of vanillin is:
(1.55 kJ/°C)*(3.29°C)/(0.2170 g) = 23.6 kJ/g