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If 64 grams of product is formed and one reactant was 25 grams, what is the mass of the other reactant?

Answer and explanation

Correct answer: 39 grams

This question uses the law of conservation of mass: in a closed chemical reaction, the total mass of the reactants equals the total mass of the products. Let the unknown reactant mass be x grams. Then 25 + x = 64, so x = 64 − 25 = 39 grams. Therefore, option A is correct. The value 25 grams merely repeats the known reactant, while 64 grams is the total product mass rather than the unknown reactant. The value 89 grams results from adding the two given numbers, but addition is inappropriate because the product total already equals the sum of both reactants.

Related tags

Law Of Conservation Of MassChemical CombinationMass CalculationReactantsLaws Of Chemical CombinationSome Basic Concepts Of ChemistryChemistryClass 11 Mcq

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