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Q.

A solution contains hydrocarbons (A) and (B) in the ratio of 2: 3. The vapour pressures of pure hydrocarbons at 250C is 300 and 100 mm of Hg respectively. Mole fraction of "B" in vapour phase is

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An Intiative by Sri Chaitanya

a

1/3

b

3/2

c

3/4

d

2/3

answer is A.

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Detailed Solution

YB=PB0χBPA0χA+PB0χB

YB=100×35300×25+100×35=13

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