Arigid, insulated tank contains steam at 3 mpa, 400 celsius. a valve on the tank is opened, allowing steam to escape. the overall process is irreversible, but the steam remaining inside the tank goes through a reversible adiabatic expansion. determine the fraction of steam that has escaped when the final state inside is saturated vapor.

x=0.8

Explanation:

Defining our values we have

Where is the pressure of the super heated steam

is the Temperature of the super heated steam

and is the pressure in an adiabatic process.

State 1

State 2

Note that here in state 2 the process is Reversible.

At the value where we have

Through this values we can calculate the Fraction of steam,

a. are