A solution of the two components that contains 62 mol

Question

Problem 11.7: Assuming toluene (1) and heptane (2) to form ideal solutions, answer the following:

a) A solution of the two components that contains 62% mol toluene is slowly heated at constant pressure. When the solution begins to boil the temperature reads 120 °C. What is the pressure?

b) The bubble pressure at 120 °C of a mixture of the two components is 2 bar. What is the dew pressure of this mixture at 120 °C?

c) A mixture of toluene and heptane that contains 61% by mole toluene is at 120 °C, 2.45 bar. What is the fugacity of toluene in this mixture?

Additional data: The saturation pressures of the pure components at 120 °C are: P1^sat = 3.0bar , P2^sat =1.81 bar.