Q$6.$ A sample consisting of $1\mathrm{.}0$mol of perfect gas molecules with $CV=20\mathrm{.}8J{K}^{-1}$ is initially at $3\mathrm{.}25$ atm and $310K.$ It undergoes reversible adiabatic expansion until its pressure reaches $2\mathrm{.}50$atm. Calculate the final volume and temperature and the work done.