Question

Combustion of carbon studies in a bomb calorimeter to obtain heat of reaction. Which of the following options are correct?

• A. The value obtained shows change in heat enthalpy.
• B. The value obtained shows change in internal energy.
• C. The volume remains constant.
• D. The pressure remains constant.

Answer 1

Answer: (B), (C)

The correct options are
B The value obtained shows change in internal energy.
C The volume remains constant.

In the combustion of fuel or Carbon occurs under constant volume conditions in the bomb calorimeter.

Hence, the internal energy of combustion is a direct measure of the heat of combustion in an engine.

So, the molar internal energy of combustion is determined from the heat capacity of the system and the temperature rise in the calorimeter.