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In a closed system 50 grams reactants give 35 grams product A and 15 grams product B. Which law is satisfied?

Answer and explanation

Correct answer: Conservation of mass

The direct answer is option A, conservation of mass. In a closed system, matter does not disappear and new matter is not created during a chemical reaction. The total mass before the reaction must equal the total mass after it. Here, the reactants have mass 50 g. The products have masses 35 g and 15 g, so product mass is 35 + 15 = 50 g. Therefore, the mass is conserved. Option A is correct because it states exactly this rule. Option B, definite proportions, concerns the fixed mass ratio of elements in one pure compound, which is not being tested here. Option C, multiple proportions, compares different compounds made from the same elements in small whole-number ratios. Option D, gaseous volumes, concerns simple volume ratios of reacting gases. Memory cue: in a closed system, add all product masses and compare them with the reactant mass.

Related tags

Chemistry Laws Chemical CombinationLaws Of Chemical CombinationSome Basic Concepts Of ChemistryChemistryClass 11 Mcq

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