16. Which of the following is true for a liquid at its equilibrium vapor pressure?
a. the rate of evaporation exceeds that of condensation.
b. the rate of condensation exceeds that of evaporation.
c. the rate of condensation and evaporation are the same.
d. the system is neither evaporating nor condensing.
e. the system is at the critical point.
Explanation: At equilibrium the rate of the forward reaction I equal to the rate of the reverse reaction. When liquid turns into gas, this process is called evaporation and the reverse process is called condensation.