A system is composed of a gas contained in a cylinder fitted with a piston. The gas expands from the state 1 for which E1 = 75 kJ to a state 2 for which E2 = -25 kJ. During the expansion, the gas does 60 kJ of work on the surroundings. The heat transferred to or from the systems during the process is:

A system is composed of a gas contained in a cylinder fitted with a pi

1.	A system is composed of a gas contained in a cylinder fitted with a piston. The gas expands from the state 1 for which E1 = 75 kJ to a state 2 for which E2 = -25 kJ. During the expansion, the gas does 60 kJ of work on the surroundings. The heat transferred to or from the systems during the process is:
A.	-30 kJ
B.	-40 kJ
C.	30 kJ
D.	40 kJ
Answer» C. 30 kJ

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