Chemistry / Chem 0416 · Atom · ~20 seconds

Mass Percentage

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A solution's mass percentage is the mass of one component divided by the solution's total mass, expressed as a percentage.

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Liquid bleach labeled 7.4% sodium hypochlorite by mass contains 7.4 g of that solute in every 100.0 g of bleach solution.

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The numerator and denominator must share identical mass units before dividing, or the resulting percentage is not a true dimensionless ratio.