The volume of a system becomes twice its original volume on the absorption of \( 300 \mathrm{cal...

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The volume of a system becomes twice its original volume on the absorption of \( 300 \mathrm{cal} \) of heat. The work done on the surrounding was found to be 200 cal. What is \( \Delta U \) for the system?
(a) \( 500 \mathrm{cal} \)
(b) \( 300 \mathrm{cal} \)
(c) \( 100 \mathrm{cal} \)
(d) \( -500 \mathrm{cal} \)
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