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A gas expands by 0.372 litre against a c...

A gas expands by `0.372` litre against a constant pressure of `1atm`. Find the work done in cal.

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The correct Answer is:
9
`W=-P_(ext)xxDeltaV`
`=-1xx0.372=-0.372` litre-atm
`0.372` litre atm`=-0.372xx1.987/0.0821~~-9.0 cal`
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