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If 28 grams of product are formed and one reactant has a mass of 12 grams, what is the mass of the other reactant?

Answer and explanation

Correct answer: 16 grams

The governing concept is conservation of mass in a chemical reaction. Assuming the reaction occurs in a closed system and there are only two reactants and one product, the sum of the reactant masses must equal the product mass. Let the unknown reactant mass be x. Then 12 g + x = 28 g, so x = 28 − 12 = 16 g. Therefore option C is correct. Option A incorrectly repeats the known mass, option B results from an incorrect subtraction, and option D treats the entire product mass as the unknown reactant while ignoring the 12 g already present. The calculation is straightforward, but the stated assumptions matter: no material should escape and no additional product or reactant should be omitted.

Related tags

Conservation Of MassMass CalculationChemical ReactionLaws Of Chemical CombinationSome Basic Concepts Of ChemistryChemistryClass 11 Mcq

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