The equation of state of a gas is given as bar v(P+10/bar v^2) = RsubuT, where the units of bar v and P are m^3/kmol and kPa respectively. Now 0.2 kmol of this gas is expanded in a quasi-equilibrium manner from 2 to 4 m^3 at a constant temperature of 350 K. Determine the unit of the quantity 10 in the equation and the work done during this isothermal expansion.