Answer
Because the vapor pressure of water at 298K is 23.78 mmHg (0.03129 atm). As long as the desired pressure is less than the equilibrium vapor pressure of water, the reaction will be spontaneous.
Work Step by Step
Because the vapor pressure of water at 298K is 23.78 mmHg (0.03129 atm). As long as the desired pressure is less than the equilibrium vapor pressure of water, the reaction will be spontaneous.
