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Ubi
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I think the confusion arises due to difference in equations from Physics and Chemistry text books. The physics text writes U=q-w ..... while chemistry says U=q+w. From the physics text its mentioned that work done by the system is positive means U=q-(+w) and work done on the system is negative means U=q-(-w)....... THEREFORE both are correct in there own way..... Hope I've figured it out correctly....

Ubi
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