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12-9. Six pound moles of ethane, three lb moles of propane and one lb mole of...

12-9. Six pound moles of ethane, three lb moles of propane and one lb mole of n-butane are mixed in a closed container and the temperature is adjusted to 75°F. What is the bubble-point pressure? What is the dew-point pressure? Calculate the compositions of the gas and liquid at equilibrium at 75°F and 300 psia.You may assume that the mixture behaves like an ideal solution.   

Component

Composition

mole fraction (Zj)

Vapor pressure at

75F (Pvj)

 Zj*Pvj Zj/Pvj
C2 0.6 ?
C3 0.3 ?
N-C4 0.1 ?
1.0

How to calculate the vapor pressure in this question?

Engineering   Chemical-Engineering   
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