During the adiabatic expansion of 2 moles of a gas, the internal energy was found to have decreased by 100 J. The work done by the gas in this process is

Question

During the adiabatic expansion of 2 moles of a gas, the internal energy was found to have decreased by 100 J. The work done by the gas in this process is (A) zero (B) - 100 J (C) 200 J (D) 100 J

Tardigrade Admin · Accepted Answer

First law of thermodynamics is dQ=dU+dW dQ=0, for adiabatic change Therefore, dW=-dU=-(-100) J =100 J

Q. During the adiabatic expansion of $2$ moles of a gas, the internal energy was found to have decreased by $100 J$ . The work done by the gas in this process is

zero

- 100 J

200 J

100 J

First law of thermodynamics is
$d Q = d U + d W$
$d Q = 0,$
for adiabatic change Therefore,
$d W = - d U = - (- 100) J$
$= 100 J$

Q. During the adiabatic expansion of 2 moles of a gas, the internal energy was found to have decreased by 100J. The work done by the gas in this process is