Question: ) . A 4 0 W heat source is applied to a gas sample for 2 5 s , during which time the gas expands

).A 40 W heat source is applied to a gas sample for 25 s, during which time the gas expands and does 750 J of work on its surroundings. By how much does the internal energy (in J) of the gas change? Please show your calculations.

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