Steam at 10 bar and 0.9 dry initially occupies (0.35 mathrm{~m}^{3}). It is expanded according to the

Question:

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.

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