1.13 A 0.5 m' rigid tank containing hydrogen at 20°C and 600 kPa is connected by a valve to another 0.5 m rigid tank that holds hydrogen at 30°C and 150 kPa. Now the valve is opened and the system is allowed to reach thermal equilibrium with the surroundings, which are at 15°C. Determine the final pressure in the tanks.

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