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A fixed vessel (the volume is 50.0 L) hold 2.00 moles of chlorine gas at a temperature of 25°C. Another 20.0 L of chlorine gas at STP are added into the fixed vessel. After fully mixing, temperature of the vessel is 14°C.

i. What is the initial pressure in the vessel? atm

ii. What is the new pressure in the vessel? atm