Question

draw vapour pressure vs composition ( in terms of mole fraction ) diagram for an ideal solution.​

Answer 1

Vapour pressure / composition diagrams

Suppose you double the mole fraction of A in the mixture (keeping the temperature constant). According to Raoult's Law, you will double its partial vapour pressure. If you triple the mole fraction, its partial vapour pressure will triple - and so on.

Answer 2

• According to Raoult's law, the partial vapour pressure of gas A at a particular temperature is directly proportional to its mole fraction.
• The partial pressure of the solvent in the solution of non-volatile solute is plotted against its mole fraction, nature of the graph is a straight line parallel to the mole fraction of the solvent.
• Relation between mole fractions of the different gases in vapour phase: The mole fraction of component A in the vapour phase is x1 and the mole fraction of component A in the liquid mixture is x2(P0A= vapour pressure of pure A; P0B = vapour pressure of pure B)

Kindly check the following graph for a better understanding:

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