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A gas occupies 2 litre at S.T.P. It is p...

A gas occupies 2 litre at S.T.P. It is provided 300 joule heat so that its becomes 2.5 litre at 1 atm. Calculate change in its internal energy.

A

330 J

B

500 J

C

356.9 J

D

249.37 J

Text Solution

Verified by Experts

`therefore` Work is caried out at constant P and thus irreversible
Work done `=-P xx DeltaV = 1 xx (2.5 -2.0) = -0.5` litre atm
`=-(0.5 xx 1.987 xx 4.184)/(0.0821) "joule" = -50.63` J
From I law of thermodyanamics
`therefore q = DeltaE -W`
300 `=DeltaE = 50.63`
`DeltaE = 249.37` joule
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