CBSE Class 12 · 2002 · Delhi · SolutionsShort Answer

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Draw a suitable diagram to express the relationship for ideal solutions of A and B between vapour pressures and mole fractions of components at constant temperature.

Solution

For an ideal solution, each partial pressure follows Raoult's law:

p_{A} = x_{A} p_{A}^{\circ}, p_{B} = x_{B} p_{B}^{\circ}

On a graph of pressure against mole fraction (

x_{A}

from 0 to 1),

p_{A}

and

p_{B}

are straight lines from the origin-ends to

p_{A}^{\circ}

and

p_{B}^{\circ}

respectively, and the total pressure

p = p_{A} + p_{B}

is the straight line joining

p_{B}^{\circ}

(at

x_{A} = 0

) to

p_{A}^{\circ}

(at

x_{A} = 1

), lying above both partial-pressure lines (see figure).

Structure Ideal solution: partial pressures and total pressure vs mole fraction (Raoult's law) — Ideal solution: partial pressures and total pressure vs mole fraction (Raoult's law)

CBSE Class 12 Board · 2002 · Delhi · Subjective

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