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Question 600038
JEE Chemistry · Hard

Mole Concept and Stoichiometry: Mole Fraction MCQ

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Mole FractionHardQuestion 600038

Question

A solution has molality 2 m (solute molar mass 60 g/mol, solvent = water). The mole fraction of solute is:
  1. A
    0.035
    Correct
  2. B
    0.034
  3. C
    0.2
  4. D
    0.1

Correct answer

0.035

Explanation

2 m means 2 mol solute in 1000 g water = 1000/18 = 55.56 mol water. χsolute = 2/(2+55.56) = 2/57.56 ≈ 0.0347 ≈ 0.035.

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