A rigid tank contains a two-phase mixture consisting of 0.2 lb of liquid water and 0.1 lb of water vapor, initially at a pressure of 25 lbf/in^2. Heat is transferred into the tank until only saturated vapor remains in the tank.
1. Determine the initial quality of the two phase mixture in the tank.
2. Find the volume of the tank.
3. Determine the specific volume of the saturated vapor at the end of the process.
4. Calculate the amount of energy transfer by heat into the tank during the process in BTU.