1. tank size 0.5 m3 hydrogen gas filling the 20 C temperatures, and pressure 600 kPa is plugged into another tank with equal volume. By filling the tank, the second-30 C temperatures, hydrogen and pressure 150 kPa when opening the valves causes the system to adapt to susom thermal balance with the environment, there is a temperature of 15 C . State shall calculate the final pressure in the tank.
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