A phase diagram of temperature versus composition for a mixture of the two volatile liquids octane (bp = and decane (bp = 126°C)is shown.
-Assume that you start with a mixture containing 0.80 mol of decane and 0.20 mol of octane,what is the vapor composition at the boiling point?
A)100% decane
B)composition at point b
C)composition at point c
D)composition at point e

Question

A phase diagram of temperature versus composition for a mixture of the two volatile liquids octane (bp =  and decane (bp = 126°C)is shown. 
-Assume that you start with a mixture containing 0.80 mol of decane and 0.20 mol of octane,what is the vapor composition at the boiling point?
A)100% decane 
B)composition at point b 
C)composition at point c 
D)composition at point e

Quizplus · Accepted Answer

The vapor composition at the boiling point is represented by the composition at point c on a phase diagram, which indicates the vapor phase in equilibrium with the liquid mixture.

A Phase Diagram of Temperature Versus Composition for a Mixture