Question
During an adiabatic expansion of 5 moles of gas, the internal energy decreases by 75 J. The work done during the process is
During an adiabatic expansion of 5 moles of gas, the internal energy decreases by 75 J. The work done during the process is
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Solution
The correct option is D 75 J
Change in internal energy is given as dU=−75JUsing first law, we have dQ−dW=dU. For adiabatic process we have dQ=0, ∴ 0−dW=dU Thus we get dW=−dU=75J
Change in internal energy is given as dU=−75J
Using first law, we have dQ−dW=dU. For adiabatic process we have dQ=0,
∴ 0−dW=dU
Thus we get dW=−dU=75J
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