Question

When 0.514 g of biphenyl (c12h10) undergoes comubustion in a bomb calorimeter, the temperature increases from 25.80 °c to 29.40 ºc. if the heat capacity of the bomb calorimeter is 5.86 kj/°c, what is the change in internal energy of the combustion of biphenyl in kj?

Answer 1

The change in internal energy of the combustion of biphenyl in Kj is calculated as follows

=heat capacity of bomb calorimeter x delta T where delta T is change in temperature
delta T = 29.4 -25.8= 3.6 c

= 5.86 kj/c x 3.6 c = 21.096 kj