A bomb calorimeter has a heat capacity of 2.47 kj/k. when a 0.105-g sample of ethylene (c2h4) was burned in this calorimeter, the temperature increased by 2.14 k. calculate the energy of combustion for one mole of ethylene.

a. - 0.259 kj/mol

b. - 50.3 kj/mol

c. - 5.29 kj/mol

d. - 1.41 * 103 kj/mol

e. - 660 kj/mol

Question

Chemistry

Leilani Santiago

20 March, 16:57

A bomb calorimeter has a heat capacity of 2.47 kj/k. when a 0.105-g sample of ethylene (c2h4) was burned in this calorimeter, the temperature increased by 2.14 k. calculate the energy of combustion for one mole of ethylene.

a. - 0.259 kj/mol

b. - 50.3 kj/mol

c. - 5.29 kj/mol

d. - 1.41 * 103 kj/mol

e. - 660 kj/mol

+3

Answers (1)

Know the Answer?

Carla Stuart · Answer 1

b.-50.3 kj/mol. a heat capacity of 2.47 kJ/K tells you that you need to dd 2.47 kJ of heat to the calorimeter in order to increase its temperature by 1 K. The expression is : q=C*Î"T, the heat absorbed by the calorimeter is 2.47 kJ/K * 2.14K = 5.29 kJ. the heat released by the combustion reaction will be equal to the heat absorbed by the calorimeter. the combustion of 0.105 g of ethylene, C2H4, will give off 5.29 kJ of heat. 0.105g/5.29kJ = 1g/x 5.29kJ/.105g=x/1g x=5.29kJ/.105 = 50.38kJ Since its combustion its - 5.29kJ