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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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Heat, `q = w = P _(ex) (20.5) = 0 (15) = 0,` Work done = 0, Heat absorbed = 0.
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