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If the mole fraction of 4.5 moles of solute is 0.5, what is the number of moles of solvent?

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If the mole fraction of 4.5 moles of solute is 0.5, what is the number of moles of solvent?

(a) 9

(b) 4.5

(c) 1.5

(d) 3

This question was addressed to me during an interview.

Question is taken from Mole Fraction and Mass(Weight) Fraction in chapter Moles, Density & Concentration of Basic Chemical Engineering

1 Answer

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Best answer
Correct answer is (b) 4.5

The best explanation: 0.5 = 4.5/(4.5 + n), => n = 4.5.

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