Isothermal Expansion Work Calculation

A sealed container holds 2 moles of an ideal gas at a temperature of 300 K. The specific heat capacities of the gas are as follows: C_v = 25 J/mol·K and C_p = 29 J/mol·K. The container undergoes an isothermal expansion until the pressure reaches half of its initial value. Assuming the expansion is reversible, what is the work done on the gas during this process?