MHT CET 2024 Chemistry question

A system performs mechanical work equal to 15 kJ and lose 2 kJ of heat to surrounding. What is the change in internal energy of a system?

(A)-15 kJ
(B)-17 kJCorrect
(C)13 kJ
(D)19 kJ

Answer: (B)

Solution

By the first law, (IUPAC sign convention: heat absorbed and work done ON the system are positive). The system loses 2 kJ of heat, so kJ; it performs 15 kJ of work on

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Question ID VK-095476