MHT CET 2022 Chemistry question

If a system absorbs 30 kJ of heat and perform 12 kJ of work on the surroundings. What is the increase in internal energy of the system?

(A)18 kJCorrect
(B)2.5 kJ
(C)42 kJ
(D)360 kJ

Answer: (A)

Solution

By the first law, (IUPAC convention). Heat absorbed by the system: kJ. Work performed by the system on the surroundings is work lost by the system, so kJ. Hence $Δ U = 30 + (-12)

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Question ID VK-093507