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Q.

gas occupies 2 liters at STP. It is provided 58.63 joule heat so that its volume becomes 2.5 litre at 1 atm. Calculate change in its internal energy_____ joule.

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answer is 8.

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Detailed Solution

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Work done=−P×ΔV=1× (2.5−2.0)
=0.5 litre.atm
=0.5×101.3
=−50.65 J
From the first law of thermodynamics,
△U=q+w
△U=58.63−50.65
∴△U=7.99J

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