1.0 mole of a monoatomic ideal gas is expanded from state I to state II at 300 K.

Thus, work done is

It is clear from the figure that process is reversible expansion

$\begin{array}{l}\mathrm{W}=-2.303\mathrm{nRTlog}\frac{V_2}{V_1}=2.303nRT\log \frac{p_1}{p_2}\\ =2.303\times 1\times 8.3143\times 300\log \left(\frac{1}{2}\right)\\ \therefore \mathrm{W}=-1729\mathrm{J}\end{array}$