A 0.5-m3 rigid tank containing hydrogen at 20℃ and 600 kPa absolute pressure is connected by a valve to another 0.5-m3 rigid tank that holds hydrogen at 30℃ and 150 kPa absolute pressure. Now the valve is opened and the system is allowed to reach thermal equilibrium with the surroundings, which are at 15℃. Determine (1) the final pressure in the tank.,(2) the total amount of the hydrogen in the two tanks