# Physical Chemistry : Calorimetry

## Example Questions

### Example Question #25 : Physical Chemistry

The heat capacity of a bomb calorimeter assembly is  . What is the heat of combustion of  of sucrose in a bomb calorimeter that results in the temperature rising from  to ?

Explanation:

A bomb calorimeter is a device used to measure the quantity of heat change for a process. The heat of a reaction which is denoted as , is the negative of the thermal energy gained by the calorimeter:

The heat capacity of a calorimeter is:

Plugging the values given into the equation gives:

Using the relation provided earlier:

Because we are dealing with 1.1 grams of sucrose, the heat of combustion of sucrose is:

### Example Question #26 : Physical Chemistry

The heat capacity of a bomb calorimeter assembly is  . What is the heat of combustion of  of caffeine in a bomb calorimeter that results in the temperature rising from  to ?

Explanation:

A bomb calorimeter is a device used to measure the quantity of heat change for a process. The heat of a reaction which is denoted as q, is the negative of the thermal energy gained by the calorimeter:

The heat capacity of a calorimeter is:

Plugging the values given into the equation gives:

Using the relation provided earlier:

Because we are dealing with 1.65 grams of sucrose, the heat of combustion of sucrose is: