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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) 0.08

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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