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First Law of Thermodynamics

Find the work...

Question

Find the work done in J when one mole of an ideal gas in 10 litre container at 1 atm is allowed to enter into an evacuated bulb of capacity 100 litre

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Solution

Work done is given as:
$w = - P_{e x t} △ V$
But since gas enters the vacuum bulb and pressure in vacuum is zero. And expansion against vacuum ( $P_{e x t} = 0$ ) called as free expansion so, work done is zero.

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