The work done in erg for the reversible expansion of one mole of an ideal gas from a volume of 10 litres to 20 litres at 25°C is

$\begin{array}{l}{\mathrm{W}}_{\mathrm{rev}}=-2.303\mathrm{nRT} \log \frac{V_2}{V_1}\\ =-2.303\times 1\times 0.0821\times 298 \log \frac{20}{10}\\ =-2.303\times 0.0821\times 298\times \log 2 \mathrm{Latm}\\ \text{ or }{\mathrm{W}}_{\mathrm{rev}}=-2.303\times 8.314\times 298\times \log 2\mathrm{J}\\ =-2.303\times 8.314\times {10}^7\times 298\times \log 2 \mathrm{erg}\end{array}$