When a liquid and its vapor are in equilibrium, the rates of evaporation of the liquid and of condensation of the vapor are equal. Assume that every molecule of the vapor striking the liquid surface condenses, and that the rate of evaporation is the same when the vapor is rapidly pumped away from the surface as when liquid and vapor are in equilibrium. The vapor pressure of mercury at 0 C is 18510-6 mmHg. Compute the rate of evaporation of mercury in a vacuum at a temperature of 0 C.