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If a system absorbs $30 \mathrm{~kJ}$ of heat and perform $12 \mathrm{~kJ}$ of work on the surrounding. What is the increase in internal energy of the system?
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18 kJ
$\begin{aligned} & \triangle E=\delta Q+\delta W \\ & =30+(-12) \\ & =18 \mathrm{KJ}\end{aligned}$
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