Question

The enthalpy of combustion of 2 moles of benzene at 27°C differs from the value determined in bomb calorimeter by

• A. \( -2.4941 \, \text{kJ} \)
• B. \( +2.4941 \, \text{kJ} \)
• C. \( -7.483 \, \text{kJ} \)
• D. \( +7.483 \, \text{kJ} \)

Hint:

The enthalpy of combustion measured in a bomb calorimeter differs from the value measured in open conditions due to the work done by the system.

Answer 1

The Correct Option is C

Step 1: Understand the concept of combustion.
The enthalpy of combustion in a bomb calorimeter is determined under constant volume, whereas in open conditions, the enthalpy change is different due to work done by the system.
Step 2: Conclusion.
The enthalpy of combustion differs by \( -7.483 \, \text{kJ} \). Final Answer: \[ \boxed{-7.483 \, \text{kJ}} \]