b. An equimolar mixture of: 40% n-butane, 10% n-hexane, 10% n-heptane, 20% benzene, and 20%

toluene are fed to the flash separator at 35 °C and 100 kPa:

i. What are the dew and bubble pressures? (A: 100 kPA, 20 kPa)

ii. What fraction of the mixture is vapor and what fraction of the vapor is benzene? (A: 20% vapor,

5% benzene)