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Graphically shoe the total work done in ...

Graphically shoe the total work done in an expansion when the state of an ideal gas is changed reversibly and isothermally from `(p_(i), V_(i))` to `(p_(f), V_(f))`. With the help of a pV plot compare the work done in the above case with that carried out against a constant pressure `p_(f)`.

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(i) Total work done in an expansion when the state of an ideal gas is changed reversibly and isothermally from `(p_(i), V_(i))` to `(P_(i), V_(f))`. Reversible work is represented by the combined areas ABC and `BCV_(i)V_(f)`.
(ii) Work against constant pressure, `p_(f)` is represented by the area `BCV_(i)V_(f)`. Work `(i) gt` Work (ii)
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