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Find out the heat absorbed and work done...

Find out the heat absorbed and work done when 5 L ofan ideal gas at 10 atm pressure expands to 20L isothermally (1) into vacuum (ii) against a constant external pressure of 1 atm (iii) to a final volume 20L reversibly.

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`q =w = P _(ex) ( V _(f) - V _(i)) = 2 atm xx (20 - 5) L = 30 L atm.`
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