First slide

Thermodynamic processes

Question

During the adiabatic expansion of 2 moles of a gas, the internal energy of the gas is found to decrease by 2 joules, the work done during the process on the gas will be equal to

Moderate

A

1 J
B

-1 J
C

2 J
D

-2 J

Solution

$\begin{array}{l} dQ = 0 = - 2 + dW \Rightarrow dW = 2 J \\ \Rightarrow Work done by the gas = 2 J \\ \Rightarrow Work done on the gas = - 2 J \end{array}$

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