What is the mass of NaCl required to make 140 grams of a 12% solution of NaCl in water?
2 answers:
Answer:
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
Answer:
C. 17 grams.
Explanation:
∵ mass % = [mass of solute/mass of solution] x 100.
mass of solute (NaCl) = ??? g & mass of solution = 140.0 g.
<em>∴ mass of NaCl = (mass %)(mass of solution)/100 </em>= (12.0)(140.0)/100 = <em>16.80 g ≅ 17.0 g.</em>
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