Question

An X molal solution of a compound in benzene has
mole fraction of solute equal to 0.2. The value of X is:-
(1) 14 (2) 3.2 (3) 1.4 (4) 2​

Answer 1

Answer:

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Explanation:

moles in 1kg benzene. Mole fraction of solute

= x/ x + 1000/78 = 0.2

= x / x + 12.82 = 0.2

=> x = 0.2 x + (12.82 × 0.2)

= 3.2

option B is right answer !

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