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A sample of a gas expands from `200cm^(3)` to `500cm^(3)` against an average pressure of 750 torr while 1.5 J heat flows into the system. What is the change in energy of the system?
(1 litre-atm=101.3J)

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Energy of the system is decreased by 28.5 J, `DeltaE=-28.5J`

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