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A substance absorbs an amount of heat Q1...

A substance absorbs an amount of heat `Q_1` in going from one state to another and releases an amount of heat `Q_2` in coming back from the second state to the first state. How much work is done by the substance and what is the change in the internal energy of the substance ?

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`W=Q_1-Q_2,thetaU=0`
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