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Question
During the expansion of an ideal gas, the work done by the gas is 100 J and the heat capacity of the process is found to be +2 J/oC. Find △U of the gas if the final temperature of the gas is 25oC higher than its initial temperature.
During the expansion of an ideal gas, the work done by the gas is 100 J and the heat capacity of the process is found to be +2 J/oC. Find △U of the gas if the final temperature of the gas is 25oC higher than its initial temperature.
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Solution
The correct option is B −50 J
From first law of thermodynamic
△U=q+w
q=+2 J/oC=2×25=50 J
W=−100 J
So, △U=50−100=−50 J
Hence, △U=−50 J
From first law of thermodynamic
△U=q+w
q=+2 J/oC=2×25=50 J
W=−100 J
So, △U=50−100=−50 J
Hence, △U=−50 J
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