In a dynamic equilibrium between the liquid state and the gas state, what is true about the rate of evaporation?

a. greater than rate of condensation

b. less than rate of condensation

c. equal to rate of condensation

d. cannot be determined.

In a dynamic equilibrium, the rate of the forward reaction is equal to the rate of the backward reaction. In the case of evaporation, if this is considered as the forward reaction, then the backward reaction is condensation. Hence, dynamic equilibrium occurs when the rate of evaporation is equal to the rate of condensation. Answer is C.