First Law of Thermodynamics: An ideal gas undergoes the process a?b?c?a shown in the pV diagram. The heat gained by the gas in process a?b is 546 J, while in process b?c the gas loses 62.0 J of heat. In process a?b the gas performs 310 J of work, while in process c?a 223 J of work is done on the gas. How much heat is gained by the gas in process c?a?
A. -397 J
B. -62 J
C. 223 J
D. 18 J
E. -236 J
Answer: A
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