7. When a liquid is in dynamic equilibrium with its vapor in a closed container:

Question

7. When a liquid is in dynamic 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. (e) the vapor will gradually change back to the liquid state, that is, no vapor will be left. 154

Explanation / Answer

(A) is correct statement regarding equilibrium condition given.

Equilibrium state is the state at which the rate of forward and backward reactions are exactly equal.

Which means at equilibrium the number of reactant molecules that can disappear in the forward reaction must exactly equal to the number of reactant molecules that can form in the back ward reaction at same rate.

So, (A) is correct for the given equilibrium.

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