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If the total product formed is 30 grams and one reactant was 7 grams what was the other reactant?

Answer and explanation

Correct answer: 23 grams

This question uses the law of conservation of mass. In a chemical reaction carried out in a closed system, the total mass of the reactants equals the total mass of the products. If the product has a mass of 30 grams and one reactant contributes 7 grams, the unknown reactant must provide the remaining mass. We calculate it as \\(30-7=23\\) grams. Therefore option A is correct. The calculation assumes that these are the complete reactants and that no material has escaped or entered the system.

The method is to write total reactant mass as the sum of the known and unknown masses: \\(7+x=30\\). Subtracting 7 grams from both sides gives \\(x=23\\) grams. Option B repeats the known mass, option C gives the total rather than the missing part, and option D does not satisfy the mass balance. Thus 23 grams is the only value consistent with conservation of mass.

Related tags

ChemistryLaws-Of-Chemical-CombinationClass-11

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