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Three moles of an ideal gas expanded spotaneously into vacuum. The work done will be

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Three moles of an ideal gas expanded spotaneously into vacuum. The work done will be
A. infinity
B. `10 J`
C. zero
D. `5 J`
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Correct Answer - C
If an ideal gas expand against vacuum, the irreversible expansion is called free expansion. As `P_(ext)=0`, therefore, for reversible as well as irrversible expansion, work done `=0`
`W_(irre)=-P_(ext)DeltaV=0xxDeltaV=0`
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