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If the total product formed is 64 grams and one reactant was 29 grams what was the other reactant?

Answer and explanation

Correct answer: 35 grams

The governing idea is the law of conservation of mass. For a closed chemical system, the combined mass of all reactants equals the mass of the product formed. If the unknown reactant has mass x, the data give x + 29 g = 64 g. Rearranging the equation, x = 64 g − 29 g = 35 g. Therefore, option B is the correct answer. Option A is only the mass of the known reactant, while option C is the total product mass and not the missing reactant. Option D comes from subtracting in the wrong way or making an arithmetic error. The units remain grams throughout the calculation.

Related tags

ChemistryLaws-Of-Chemical-CombinationMass-ConservationLaws Of Chemical CombinationSome Basic Concepts Of ChemistryClass 11 Mcq

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