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In different samples of pure K₂O, the percentage of elements remains the same. Which law is this?

Answer and explanation

Correct answer: Law of definite proportions

The governing principle is the law of definite proportions, or constant composition. A pure compound has a fixed chemical formula, so the elements in it occur in a constant ratio by mass in every sample. K₂O always contains potassium and oxygen in the same mass relationship; changing the sample size changes the total amounts but not their percentages. The conservation law refers to the unchanged total mass in a chemical process. The multiple-proportions law compares the masses of one element that combine with a fixed mass of another in two or more different compounds, not repeated samples of one compound. The gaseous-volumes law concerns reacting gases. Therefore option A is correct.

Related tags

ChemistryDefinite-ProportionsChemical-Combination-LawsLaws Of Chemical CombinationSome Basic Concepts Of ChemistryClass 11 Mcq

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