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7.5 kJ of heat is added to a closed system and its internal energy decreases by 12 kJ, then how much energy is transferred as work?

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- 4.5 kJ

19.5 kJ

-19.5 kJ

4.5 kJ

answer is B.

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Detailed Solution

$\begin{array}{l} Δ U = q + w \\ - 12 = 7.5 + w \\ \Rightarrow w = - 19.5 kJ \end{array}$

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