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Question
An ideal gas is expanded against 42 Pascal external pressure by 10 m3. If 350 J heat is given to the system then â–³U of system (in J) will be:
An ideal gas is expanded against 42 Pascal external pressure by 10 m3. If 350 J heat is given to the system then â–³U of system (in J) will be:
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Solution
The correct option is A −70 J
W=−Pext(△V)=−42(10)=−420 JQ=850 J (given)According to first law of thermodynamics, △U=Q+W△U=+350−420=−70 J
W=−Pext(△V)
=−42(10)=−420 J
Q=850 J (given)
According to first law of thermodynamics,
△U=Q+W
△U=+350−420=−70 J
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