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A student says conservation of mass means each product mass equals each reactant mass. What is the correct correction?

Answer and explanation

Correct answer: The total mass is equal

The governing concept is the law of conservation of mass. In an ordinary chemical reaction, atoms are rearranged, but they are neither created nor destroyed. Therefore, the sum of the masses of all reactants equals the sum of the masses of all products, provided the reaction is considered in a closed system. This law does not say that the mass of each individual product must equal the mass of each individual reactant. For example, if 12 g of carbon reacts with 32 g of oxygen, the product carbon dioxide has a total mass of 44 g. The correct statement is therefore option C. Option A wrongly compares separate substances, option B contradicts the law, and option D concerns an irrelevant physical property.

Related tags

ChemistryLaws-Of-Chemical-CombinationClass-11Laws Of Chemical CombinationSome Basic Concepts Of ChemistryClass 11 Mcq

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