A gas expands isothermally against a constant P external pressure o...

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A gas expands isothermally against a constant
P external pressure of \( 1 \mathrm{~atm} \) from a volume of \( 10 \mathrm{dm}^{3} \)

W to a volume of \( 20 \mathrm{dm}^{3} \). It absorbs \( 800 \mathrm{~J} \) of thermal energy from its surroundings. The \( \Delta \mathrm{U} \) is
(1) \( -312 \mathrm{~J} \)
(2) \( +123 \mathrm{~J} \)
(3) \( -213 \mathrm{~J} \)
(4) \( +231 \mathrm{~J} \)
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