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A student assumes mass of each product equals mass of each reactant. What is the mistake?

Answer and explanation

Correct answer: Total mass is equal, not each substance

The governing concept is the law of conservation of mass, which applies to the total mass of a complete reaction system, not to each individual substance. A chemical reaction rearranges atoms, so reactants are converted into products with different identities and often different individual masses. What remains equal is the sum of all reactant masses and the sum of all product masses, provided the system is closed: total reactant mass = total product mass. Therefore, option A is correct. Options B and C make false generalisations, while D incorrectly suggests that products cannot be measured.

Related tags

ChemistryLaw Of Conservation Of MassReactants And ProductsLaws Of Chemical CombinationSome Basic Concepts Of ChemistryClass 11 Mcq

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