Mole ConceptHard

Question

If the ratio of mole fractions of solute and solvent is unity, then the mass percent of solute is

(Molar masses of solute and solvent are X and Y, respectively)

Options

A.50%
B.(X/X+ Y) × 100%
C.(X/Y) × mass per cent of solvent
D.(Y/ X) × mass per cent of solvent

Solution

Mass of solute = n × x g

Mass of solvent = n × y g

∴ Mass per cent of solute = $\frac{x}{x + y} \times 100\%$

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