5. A 0.7-m³ rigid tank containing nitrogen at 50°C and 400 kPa is connected by a valve to another 0.7-m³ rigid tank that is evacuated. Now the valve is opened and the system is allowed to reach thermal equilibrium with the surroundings, which are at 5°C. (a) Determine the final pressure in the tanks. (b) Write the assumption(s) you made for the solution.