A piston-cylinder device contains 5 kg of water as a saturated mixture at 100 kPa. Initially 75% of the mass is liquid. Determine the amount of heat transfer required to vaporize all the liquid in the tank. Assume a constant pressure process. 2- Consider a piston-cylinder setup with air which goes through a polytropic process from 125 kPa and 325" K to 300 kPa and 500 K. Find polytropic exponent n, specific work, change in internal energy, enthalpy, and the amount of heat transfer per unit of mass in this process. 3- Cogeneration is often used where a steam supply is needed for industrial process energy. Assume that a supply of 5 kg/s steam at 0.5 MPa is needed. Rather than generating this from a pump and a boiler, the setup in the figure is used to extract the supply from the high-pressure adiabatic turbine. 20 kgls supply 10 MPa 500C High-P Low-P turbine turbine 5 kgis process steam Find the power output of turbine in this 0.5 MPa 155C 15 kg/s to condenser process. 20 kPa Assume velocities are negligible. x-0.90