How is this different from molarity?

Mass percent uses mass of solution, while molarity uses moles of solute per liter of solution — mass percent doesn't require knowing the solute's molar mass.

Mass Percent Concentration Calculator

Mass percent concentration expresses how much of a solution's total mass comes from the dissolved solute.

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Mass Percent Concentration: 6%

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Formula

Mass % = (Mass of Solute / Mass of Solution) × 100

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Solution Concentration: Five Ways to Express the Same Idea

Mass percent, molality, parts per million, percent composition, and dilution factor — five different units for describing how concentrated a solution is.

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