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

nmdcat.online July 13, 2026

Regarding the reaction CaCO₃ → CaO + CO₂, thermal decomposition of 2.5 moles of calcium carbonate produces

A. 1.25 moles of CO₂

B. 2.5 moles of CO₂

✓

C. 5.0 moles of CO₂

D. 7.5 moles of CO₂

📝 Explanation

The balanced equation indicates a 1 : 1 mole ratio between CaCO₃ and CO₂. Therefore, 2.5 moles of CaCO₃ yield 2.5 moles of CO₂. Concept tested: Stoichiometric mole calculations.

📖 Additional Information

1.25 moles of CO₂
2.5 moles of CO₂
5.0 moles of CO₂
7.5 moles of CO₂

The balanced equation indicates a 1 : 1 mole ratio between CaCO₃ and CO₂. Therefore, 2.5 moles of CaCO₃ yield 2.5 moles of CO₂. Concept tested: Stoichiometric mole calculations.

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