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A pure compound contains 55 percent A and 45 percent B. What is the simple mass ratio A:B?

Answer and explanation

Correct answer: 11:9

The mass percentages of A and B are 55 and 45 respectively, so their mass ratio is 55:45. Dividing both terms by 5 gives the simplest ratio, 11:9. The ratio 9:11 reverses the order, while 5:4 is not equivalent to 55:45. Exam tip: To obtain a ratio from percentage composition, write the percentages as a ratio and reduce it using their highest common factor.

Related tags

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

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