Superheated steam is stored in a large tank at 5 MPa and 800oC. The steam is exhausted

Question:

Superheated steam is stored in a large tank at 5 MPa and 800oC. The steam is exhausted is entropically through a converging-diverging nozzle. Determine
(a) The exit pressure.
(b) The exit velocity for the condensation to begin at the exit. Use the PC model for steam.