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What is 500 ppm expressed as mass percent?

Answer and explanation

Correct answer: 0.05 percent

For mass concentration units, 1 ppm means one part in 1,000,000, while 1% means one part in 100. Consequently, 1% = 10,000 ppm. Therefore, 500 ppm expressed as a percentage is 500 ÷ 10,000 = 0.05%. Equivalently, 500 × 10−6 × 100 = 0.05%. The other options shift the decimal point by factors of ten or one hundred.

Related tags

PpmMass PercentageConcentration ConversionMole Concept And Molar MassSome Basic Concepts Of ChemistryChemistryClass 11 Mcq

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