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Which among the following equations represents the first law of thermodynamics under isobaric conditions?

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Which among the following equations represents the first law of thermodynamics under isobaric conditions?
A. `DeltaU = q_(p) - p_(ex). DeltaV`
B. `q_(v) = DeltaU`
C. `DeltaU = W`
D. `W=-q`
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Correct Answer - A
`DeltaU = q_(p) + W`
`=q + (-P_(ex).DeltaV)(therefore W=P_(ex). DeltaV)`
`DeltaU = q_(q) - P_(ex). DeltaV`
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