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Question
A gas occupies a volume of 2 L at STP. It is provided with 58.65 J of heat so that its volume becomes 2.5 L at 1 atm. Calculate the change in its internal energy. (Take 1atm.L=101.3 J)
A gas occupies a volume of 2 L at STP. It is provided with 58.65 J of heat so that its volume becomes 2.5 L at 1 atm. Calculate the change in its internal energy. (Take 1atm.L=101.3 J)
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Solution
The correct option is A 8 J
Work done =−P×△V=−1×(2.5−2.0)
=−0.5 L atm
Converting to joule,
−0.5×101.3=−50.65 J
From the first law of thermodynamics,
Q=△U−W
58.65=△U+50.65
∴ △U=8 J
Work done =−P×△V=−1×(2.5−2.0)
=−0.5 L atm
Converting to joule,
−0.5×101.3=−50.65 J
From the first law of thermodynamics,
Q=△U−W
58.65=△U+50.65
∴ △U=8 J
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