A mixture of hydrocarbons has the following molar composition: 1% methane, 15% ethane, 25% propane, 14% isobutane, 25% n-butane, 20% n-pentane, for a total of 100.

The mixture exists at a pressure of 100 psia and is entirely in the vapor phase.

a) What is the minimum temperature at which it could be steam?

b) What percentage of moles of the vapor condenses if the mixture is cooled to 90F?

c) Calculate the composition of the liquid and vapor of part b)

d) For the conditions of part b)

What percentage of the total methane present is in the vapor phase?

What percentage of the total pentane present is in the vapor phase