The work done during reversible isothermal expansion of one mole of hydrogen gas at 25^° C from pressure of 20 atmosphere to 10 atmosphere is: (Given…

The work done during reversible isothermal expansion of one mole of hydrogen gas at $\displaystyle 25^{\circ} \mathrm{C}$ from pressure of $\displaystyle 20$ atmosphere to $\displaystyle 10$ atmosphere is: (Given $\displaystyle \mathrm{R}=2.0 \mathrm{cal} \mathrm{K}^{-1} \mathrm{~mol}^{-1}$ )