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In a reaction, the total mass of the reactants is 36 grams. If product A has a mass of 13 grams and product B has a mass of 17 grams, what is the mass of the third product?

Answer and explanation

Correct answer: 6 grams

The governing concept is conservation of mass. If the reaction is treated as a closed system and all products are included, the total mass of the products must equal the total mass of the reactants, which is 36 g. The first two products together have mass 13 g + 17 g = 30 g. If the third product has mass x, then 30 g + x = 36 g, giving x = 36 − 30 = 6 g. Thus option B is correct. Option A subtracts incorrectly, option C may result from using only one given product, and option D does not satisfy the total. Checking the final sum confirms the answer: 13 + 17 + 6 = 36 g, exactly matching the reactant mass.

Related tags

Conservation Of MassProduct MassStoichiometric CalculationLaws Of Chemical CombinationSome Basic Concepts Of ChemistryChemistryClass 11 Mcq

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