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In two compounds 12 grams of the same element combine with 16 grams and 32 grams oxygen. What is the ratio of oxygen masses?

Answer and explanation

Correct answer: 1:2

The mass of the other element is the same, 12 g, in both compounds. Therefore, the oxygen-mass ratio is directly 16:32. Dividing both terms by 16 gives 1:2. Option 1:1 is incorrect because the masses of oxygen in the two compounds are not equal. Exam tip: before comparing masses, check whether the mass of the other element is kept fixed.

Related tags

ChemistryChemical CombinationMultiple ProportionsMass RatioClass 11 ChemistryLaws Of Chemical CombinationSome Basic Concepts Of ChemistryClass 11 Mcq

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