The work done during the process when $1 m o l e$ of gas is allowed to expand freely into the vacuum is:

0

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p o s i t i v e

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n e g a t i v e

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e i t h e r o f t h e s e

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Solution

The correct option is B $0$
Given: Number of moles $n = 1$
Since, gas expand freely in vaccum. $\Rightarrow P_{e x t e r n a l} = 0 a t m$
$W o r k d o n e = - P_{e x t} (V_{2} - V_{1})$
$W = 0$

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