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2015-11-03T01:47:09+05:30

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According to chemical thermodynamics, Work done by the system(w)=-ve Heat supplied to the system(q)=+ve ∆E=q-w
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2015-11-07T18:30:30+05:30

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According to 1st law of thermodynamics:

   ΔQ = Δ U + W

q = ΔU + w

=>  ΔU = change in internal energy = q - w

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