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If the total product formed is 45 grams and one reactant was 18 grams what was the other reactant?

Answer and explanation

Correct answer: 27 grams

The governing concept is conservation of mass in a closed chemical reaction. The masses of all reactants together must equal the mass of the product, so if the unknown reactant is x, the equation is 18 g + x = 45 g. Isolating x requires subtracting 18 g from the total: x = 45 − 18 = 27 g. Thus option C is correct. Option A repeats the known reactant, option B mistakes the complete product for the missing part, and option D does not satisfy the equation because 18 + 9 equals only 27 g. The answer follows directly from the stated complete-mass assumption.

Related tags

ChemistryConservation Of MassChemical Combination LawsLaws Of Chemical CombinationSome Basic Concepts Of ChemistryClass 11 Mcq

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