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# Delta E

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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?

https://brainmass.com/chemistry/physical-chemistry/change-internal-energy-example-problem-527528

## 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

This content was COPIED from BrainMass.com - View the original, and get the already-completed solution here!