Steam at 10 bar and 0.9 dry initially occupies \(0.35 \mathrm{~m}^{3}\). It is expanded according to the law \(p v^{1.25}=\) const until the pressure falls to 2 bar. Determine

(a) the mass of steam used in the process, \((b)\) the work, done, \((c)\) the change in internal energy, and \((d)\) the heat exchange between steam and surroundings.