One mole of a pure species exists in liquid–vapor equilibrium in a rigid container of volume V = 1 L, a temperature of 300 K, and a pressure of 1 bar. The enthalpy of vaporization and the second virial coeffi cient in the pressure expansion are:

Assume the enthalpy of vaporization does not change with temperature. You may neglect the molar volume of the liquid relative to that of the gas.

(a) How many moles of vapor are there?

(b) This container is heated until the pressure reaches 21 bar and is allowed to reach equilibrium.
Both vapor and liquid phases are still present. Find the fi nal temperature of this system.

(c) How many moles of vapor are there now?

Transcribed Image Text:

Ahvap 16,628 [J/mol] and B' = -1 10-7 [m/J]