”A rigid insulated container fitted with a paddle wheel contains 5lb of water, initially at 260F and a quality of 60%. The water is stirred until the temperature is 350F. For the water, determine the work.”
How do we know whether the state of the water at 350F is still saturated water or superheated vapor ?
"Water, contained in a closed rigid tank initially at 100lbf/in^2, 800F is cooled to a final state where the pressure is 20lbf/in^2. Determine the change in specific entropy."
likewise for this question, how do I know if the water is still superheated vapor or not at the final state?
2. Relevant equations
3. The attempt at a solution