Question

Q 11/30 When two volatile liquids A(Solvent) and B(Solute) are
mixed assuming B is more volatile, then correct option about plot of
vapour pressure versus mole fraction of B is


(a) Negative slope

(b) Final vapour pressure is. higher than A

(c) Vapour pressure of A increases

(d) Vapour pressure of solution decreases​

Answer 1

ANSWER

According to Dalton's Law of Partial Pressures, 

partial Pressure of each component gas is proportional to their mole fractions in the vapour. 

 

 Hence,

Partial Pressure of A =Pa=400×0.45=180

Partial Pressure of B= Pb=400×(1−0.45)=220

Also, Partial Pressure of the gas in the vapour 

= (Vapour Pressure) × (Mole Fraction of Liquid in solution) 

Hence,

Vapour Pressure of A =Va=1800.65≈277

Vb=(1−0.65)220≈629

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