First slide

Thermodynamic processes

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

Moderate

A

Zero
B

–100 J
C

200 J
D

100 J

Solution

For adiabatic process from FLOT
$\begin{array}{l} ΔW = - ΔU (∵ ΔQ = 0) \\ \Rightarrow ΔW = - (- 100) = + 100 J \end{array}$

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