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If 27 grams of water contains 3 grams of hydrogen, what is the mass of oxygen?

Answer and explanation

Correct answer: 24 grams

The governing concept is conservation of mass in a compound. The total mass of water is made up of the masses of hydrogen and oxygen, so the mass of oxygen equals the total mass minus the mass of hydrogen. Calculation: oxygen mass = 27 g − 3 g = 24 g. Therefore, option C is correct. A quick check is 3 g hydrogen + 24 g oxygen = 27 g water. Option A and option B do not provide the complementary mass required to reach 27 g, while option D simply repeats the total mass and ignores the hydrogen already included. The calculation assumes the stated sample contains only these two components, as water does.

Related tags

ChemistryConservation Of MassCompound CompositionLaws Of Chemical CombinationSome Basic Concepts Of ChemistryClass 11 Mcq

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