Equilibrium Is Established Between a Liquid and Its Vapor When

Multiple Choice

Equilibrium is established between a liquid and its vapor when

A) the rate of evaporation equals the rate of condensation.
B) equal masses exist in the liquid and gas phases.
C) equal concentrations (in molarity) exist in the liquid and gas phases.
D) all the liquid has evaporated.
E) the liquid ceases to evaporate and the gas ceases to condense.