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What is the mole fraction of sodium with moles n in a solution with moles of solvent N?

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What is the mole fraction of sodium with moles n in a solution with moles of solvent N?

(a) N/n

(b) n/N

(c) n/(n + N)

(d) N/(n + N)

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I need to ask this question from Mole Fraction and Mass(Weight) Fraction in portion Moles, Density & Concentration of Basic Chemical Engineering

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Correct option is (c) n/(n + N)

Best explanation: Mole fraction is the ratio of moles of solvent and the total number of moles of solution, => mole fraction = n/(n + N).

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