A bomb calorimeter, or constant volume calorimeter, is a device often used to de

Question

A bomb calorimeter, or constant volume calorimeter, is a device often used to determine the heat of combustion of fuels and the energy content of foods. Since the "bomb" itself can absorb energy, a separate experiment is needed to determine the heat capacity of the calorimeter. This is known as calibrating the calorimeter. In the laboratory a student burns a 0.451-g sample of bisphenol A (CisHisO2 in a bomb calorimeter containing 1080. g of water. The temperature increases from 25.90 C to 28.80 °C. The heat capacity of water is 4.184 J g°C The molar heat of combustion is -7821 k per mole of bisphenol A. Calculate the heat capacity of the calorimeter. heat capacity of calorimeter-

Explanation / Answer

Molar mass of bisphenol is 228 g/ mol

Given molar heat of combustion is (-7821 kJ/ mol)*(1 mol / 228 g)*(0.451 g) *(1000 J/ kJ)= -15470.5 J= Q

This Q is utilised to increase the temperature of calorimeter and water.

Q= mc'dt' + Ldt

Where m = mass of water= 1080 g

c= specific heat capacity of water= 4.184 J/ goC

dT= Change in temperature= 28.80-25.90=2.90 oC

L= heat capacity of calorimeter= ?

Plug the values we get L= 815.9 J/oC

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