What is the answer to this question? 1) When a liquid is in equilibrium with its

Question

What is the answer to this question?

1) When a liquid is in equilibrium with its vapor in a closed container:

A) the rate at which molecules from the liquid phase enter the gas phase exactly

equals the rate at which molecules from the gas phase pass into the liquid phase

B) a change in temperature will not change the pressure in the container

C) the amount of gas in the container must exactly equal the amount of liquid

D) molecules cannot go from the liquid phase to the gas phase because the amount of liquid in the container is constant

Explanation / Answer

An equilibrium is defined as the condition in which the rate of forward and reverse processes take place at same rate.

So the answer is

A) The rate at which molecules from the liquid phase enter the gas phase exactly equals the rate at which the molecules from the gas phase pass into the liquid phase.

The amounts in each phase need not necessarily be equal. Only the rates have to be equal.

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