A solution has 25% w/w solution of Sodium Chloride in 10 grams of water what is the mole fraction of Sodium Chloride?(a) 0.05(b) 0.06(c) 0.07(d) 0.08I had been asked this question in an international level competition.The above asked question is from Mole Fraction and Mass(Weight) Fraction topic in division Moles, Density & Concentration of Basic Chemical Engineering

A solution has 25% w/w solution of Sodium Chloride in 10 grams of wate

1.	A solution has 25% w/w solution of Sodium Chloride in 10 grams of water what is the mole fraction of Sodium Chloride?(a) 0.05(b) 0.06(c) 0.07(d) 0.08I had been asked this question in an international level competition.The above asked question is from Mole Fraction and Mass(Weight) Fraction topic in division Moles, Density & Concentration of Basic Chemical Engineering
Answer» RIGHT answer is (C) 0.07 For explanation: Mass of sodium CHLORIDE = 10*25/100 = 2.5 GRAMS, => moles of sodium chloride = 2.5/58.5 = 0.0427, moles of water = 10/18 = 0.555, => mole fraction = 0.0427/(0.0427 + 0.555) = 0.07.

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