Question: A rigid, insulated vessel contains superheated vapor steam at 3 MPa, 400C. A valve on the vessel is opened, allowing steam to escape. The overall

A rigid, insulated vessel contains superheated vapor steam at 3 MPa, 400°C. A valve on the vessel is opened, allowing steam to escape. The overall process is irreversible, but the steam remaining inside the vessel goes through a reversible adiabatic expansion. Determine the fraction of steam that has escaped, when the final state inside is saturated vapor.

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