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19-03-2024
Chemistry

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A gas expands isothermally against a constant external pressure of 1 atm from a volume of 10 dm³ to a volume of 20 dm³. It absorbs 300 J of thermal energy from its surrounding. The △U is:
A. −312 J
B. +123 J
C. −213 J
D. +231 J

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