The volume of a system becomes twice its original volume on the absorption of 300 cal of heat. The work done on the surrounding was found to be 200 cal. What is Δ U for the system?

Question

Prashant Kotian · Accepted Answer

Correct answer: C. According to First Law of Thermodynamics: Δ U = q + w. Heat absorbed q = +300 cal. Work done on surroundings (by system) w = -200 cal. Thus, Δ U = 300 - 200 = +100 cal.

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