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A certain system is exothermic by $260 \mathrm{~kJ}$ and does $10 \mathrm{~kJ}$ of work. What is the change in internal energy?
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The correct answer is:
$-270 \mathrm{~kJ}$
$\begin{aligned} & \Delta E=8 Q+8 W \\ & =-260+(-10) \\ & =-270 \mathrm{KJ}\end{aligned}$
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