Chemistry NMDCAT MCQs Moles and Avogadro's Numbers Moles and Avogadro’s Numbers

nmdcat.online July 13, 2026

Among the following statements, the most appropriate explanation for using mole ratios instead of mass ratios in balanced equations is

A. Chemical equations represent reacting particles rather than masses

✓

B. All reactants have equal molar masses

C. Mole ratios change with temperature

D. Mass is not conserved during reactions

📝 Explanation

The coefficients in a balanced chemical equation represent the relative numbers of molecules or moles participating in the reaction. Masses depend on molar masses and are not directly represented by the coefficients. Concept tested: Significance of mole ratios in stoichiometry.

📖 Additional Information

Chemical equations represent reacting particles rather than masses
All reactants have equal molar masses
Mole ratios change with temperature
Mass is not conserved during reactions

The coefficients in a balanced chemical equation represent the relative numbers of molecules or moles participating in the reaction. Masses depend on molar masses and are not directly represented by the coefficients. Concept tested: Significance of mole ratios in stoichiometry.

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