A3m³ tank is divided into two parts via a thermally insulated wall. One part has a volume of 2 m³ and contains a vapor-liquid mixture of steam, 7% liquid, at 5 bar. The other part contains steam at 10 bar, 500 °C. A valve is opened and allows the two parts to thoroughly mix.

a) Determine the final pressure and temperature in the tank assuming no losses to the surroundings. 

b) Determine the amount of heating or cooling that must be supplied in order to make the final pressure 5 bar.