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A pure compound contains 28 percent A and 72 percent B. What is the simple mass ratio A:B?

Answer and explanation

Correct answer: 7:18

The mass percentages of A and B are 28 and 72 respectively, so A:B = 28:72. Dividing both terms by their greatest common divisor, 4, gives 7:18. Although 28:72 is the initial ratio, it is not in simplest form. Exam tip: simplify a ratio of percentages by dividing both numbers by their greatest common divisor.

Related tags

ChemistryChemical CombinationMass RatioPercentage CompositionClass 11Laws Of Chemical CombinationSome Basic Concepts Of ChemistryClass 11 Mcq

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