n moles of an ideal gas with constant volume heat capacity C v undergo an isobaric expansion by certain volume. The ratio of the work done in the process, to the heat supplied is:

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From First Law of thermodynamics, Δ Q = Δ U + Δ w Δ w Δ Q = 1 - Δ U Δ Q = 1 - n c v Δ T n c p Δ T = 1 - c v R + c v = R R + c v As, n c v = C v Δ w Δ Q = n R C v + n R

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