a) Identify the following systems as open, closed, or isolated.
i) Coolant in a refrigerator coil
ii) The combustion of liquid hexane in a bomb calorimeter
b) A gas sample heated in a cylinder uses 650 kJ of heat. A piston that compresses this gas does 800 kJ of work. what is the change in internal energy, delta E, of the gas during this process?© BrainMass Inc. brainmass.com December 24, 2021, 11:01 pm ad1c9bdddf
SOLUTION This solution is FREE courtesy of BrainMass!
A coolant in a refrigerator coil is a closed system as it exchanges heat with the surrounding but not matter. On the other hand, a bomb calorimeter is an isolated system if it is indeed perfectly insulated. Isolated systems exchange neither heat nor matter with the surroundings.
dE = q+w
Here because the gas absorbs heat , q = +650 kJ
Work is done on the gas, hence w = + 800 kJ
Hence dE for the gas = 650 + 800 = 1450 kJ© BrainMass Inc. brainmass.com December 24, 2021, 11:01 pm ad1c9bdddf>