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28 December, 11:19

What is the mass of NaCl required to make 140 grams of a 12% solution of NaCl in water?

A. 12 grams

B. 14 grams

C. 17 grams

D. 18 grams

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Answers (2)
  1. 28 December, 12:20
    0
    C. 17 grams.

    Explanation:

    ∵ mass % = [mass of solute/mass of solution] x 100.

    mass of solute (NaCl) = ? g & mass of solution = 140.0 g.

    ∴ mass of NaCl = (mass %) (mass of solution) / 100 = (12.0) (140.0) / 100 = 16.80 g ≅ 17.0 g.
  2. 28 December, 13:23
    0
    mass of NaCl required = 17 grams

    Explanation:

    Mass% = mass of solute X 100 / total mass of solution

    mass% = mass of solute X 100 / mass of solute + mass of solvent

    given:

    Mass of solution = 140 grams

    mass % = 12%

    Putting values

    12 = mass of NaCl X 100 / 140

    mass of NaCl = 12 X 140 / 100 = 16.8 grams

    mass of NaCl required = 17 grams
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