MHT CET 2025 Chemistry question

Chemistry Thermodynamics MHT CET 2025

Calculate the change in internal energy of the system if 20 kJ of work is done on the system and it releases 10 kJ of heat in a particular reaction

(A)30 kJ
(B)10 kJCorrect
(C)-15 kJ
(D)-20 kJ

Answer: (B)

Solution

By the first law, with the sign convention that energy entering the system is positive. Work is done on the system, so kJ; the system releases heat, so

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Question ID VK-100729