Chemistry / Unit 3 Chem 0416 short lesson, about 20 seconds
Mass Percentage
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The idea
A solution's mass percentage is the mass of one component divided by the solution's total mass, expressed as a percentage.
In practice
Liquid bleach labeled 7.4% sodium hypochlorite by mass contains 7.4 g of that solute in every 100.0 g of bleach solution.
Where people slip
The numerator and denominator must share identical mass units before dividing, or the resulting percentage is not a true dimensionless ratio.
Your place on the trail
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