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A 0.35 m B 0.25 m D 0.02 m
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Solution
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2% NaCl means 2 grams NaCl present in 100grams solution. Mass of solution is the sum of masses ofsolute and solvent. Our solute is NaCl and the solvent is water. mass of solvent = mass ofsolution - mass of solute molality is the moles of solute per kg ofsolvent. Moles of NaCl could be calculated ondividing it's grams by it's molar mass(58.44). moles of NaCl = 2g×158.44 = 0.034moles molality of solution = 0.0340.098 molality of solution = 0.35m mass of solvent = 100−2=98g=0.098kg 2 % NaCl molality is 0.35m. Hence, option B is correct.
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