Did the vapor pressure of this liquid change when you squeezed the gas down?
I think not.
Therefore the pressure did not change.
You have half as many gas molecules above the fluid.
Half the gas molecules condensed back into liquid form.
Assume that you have a liquid in a cylinder equipped with a movable piston. There is no air in the cylinder, the volume of space above the liquid is 200 mL, and the equilibrium vapor pressure above the liquid is 29.0 mm Hg. What is the equilibrium pressure above the liquid when the volume of space is decreased from 200 mL to 100 mL at constant temperature?
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