You have liquid-vapor equilibrium for one mole of a pure substance. the substance is held in a rigid container with a volume of 1l, at a temperature of 300k & a pressure of 1bar. the enthalpy of vaporization & the second virial coefficient in the pressure expansion are given below; δhvap = 16,628 j/mol , b’ = -1x10-7 m3/j assume the enthalpy of vaporization does not change with temperature. additionally, the molar volume of the liquid can be neglected relative to the molar volume of the vapor. a. how many moles of vapor are there? b. the container is heated until the pressure reaches 21 bar, and is allowed to reach equilibrium. both vapor & liquid phases are still present. find the final temperature of this system. c. how many moles of vapor are there now?