A total of 400 mL of water is transferred into a 1.0 L container at 1.00 atm and 298.15 K. The container is then immediately sealed, at which point there is 400 mL of water and 600 mL headspace containing atmospheric gas at 1.00 atm. The entire container is then heated to a temperature of 333.15 K and allowed to reach equilibrium at that temperature. What is pressure of the gas in the headspace above the liquid water in units of atm?

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