One mole of an ideal gas at $310\mathrm{K}$ and $10\mathrm{atm}$ expands isothermally against a constant external pressure of $2\mathrm{atm}$ until its pressure becomes $2\mathrm{atm}$. Take $R=8.314\mathrm{J}\mathrm{mo}{\mathrm{l}}^{-1}{\mathrm{K}}^{-1}$. The magnitude of work done by the gas, to the nearest joule, is

Numerical answer type, answer in J, tolerance 1.