\mathrm{~kg}\) of air at \(50^{\circ} \mathrm{C}\) expands reversibly and adiabatically to 5 times its original volume. The initial pressure of the air mass was \(8 \mathrm{~atm}\). Determine the final pressure, temperature, and work done when the expansion is (i) adiabatic and (ii) isothermal, given that the heat capacity ratio \(=\gamma=1.4\).