A 0.5m3 rigid tank containing hydrogen at 20C and 600kPa is connected by a valve to another 0.5m3 rigid tank that holds hydrogen at 30C and 150kPa. Now the valve is opened and the system is allowed to reach thermal equilibrium with the surroundings, which are at 15C. Determine the final pressure in the tank. Problem 4: Pure ethylene (C2H4) and oxygen are fed to a process for the manufacture of ethylene oxide (C2H4O) : C2H4+21O2C2H4O Figure P13.46 is the flow diagram for the process. The catalytic reactor operates at 300C and 1.2atm. At these conditions, single-pass measurements on the reactor show that 50% of the ethylene entering the reactor is consumed per pass, and of this, 70% is converted to ethylene oxide. The remainder of the ethylene reacts to form CO2 and water