Question

The combustion of 0.1584 grams of benzoic acid increases the temperature of a bomb calorimeter. The resulting heat is used to determine:

A) Enthalpy change of the combustion reaction
B) Temperature change in the environment
C) Specific heat of benzoic acid
D) Heat capacity of the bomb calorimeter

Answer 1

To determine the enthalpy change of the combustion reaction, calculate the heat released by the combustion of benzoic acid and use it to find the heat capacity of the calorimeter. Then, multiply the heat capacity by the temperature change to determine the enthalpy change of the combustion reaction of glucose.

Step-by-step explanation:

To determine the enthalpy change of the combustion reaction, we need to calculate the heat released by the combustion of benzoic acid in the bomb calorimeter using its AH comb value. We can use Equation 5.5.9 to determine the heat capacity of the calorimeter (Cbomb) from the measured increase in temperature of the calorimeter. Then, to determine the enthalpy change of the combustion reaction of glucose, we can multiply the heat capacity of the bomb by the temperature change and divide it by the mass of glucose. Finally, we can calculate the AH comb of glucose by multiplying the amount of heat released per gram by the molar mass of glucose.