MHT CET 2024 Chemistry question

In a particular reaction 'x' kJ of heat is released by the system and 'y' kJ of work is done on the system. What is internal energy change ?

(A)x- y kJ
(B)y - x kJCorrect
(C)x + y kJ
(D)xy kJ

Answer: (B)

Solution

By the first law, with the sign convention that heat absorbed by the system and work done on the system are positive. Heat released by the system: kJ. Work done on the system: kJ. Therefore

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Question ID VK-095501