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

nmdcat.online July 13, 2026

During the reaction Ca + 2HCl → CaCl₂ + H₂, complete reaction of 3 moles of calcium requires

A. 2 moles of HCl

B. 3 moles of HCl

C. 6 moles of HCl

✓

D. 9 moles of HCl

📝 Explanation

The balanced equation shows that 1 mole of Ca reacts with 2 moles of HCl. Therefore, 3 moles of Ca require 6 moles of HCl. Concept tested: Mole ratio application.

📖 Additional Information

2 moles of HCl
3 moles of HCl
6 moles of HCl
9 moles of HCl

The balanced equation shows that 1 mole of Ca reacts with 2 moles of HCl. Therefore, 3 moles of Ca require 6 moles of HCl. Concept tested: Mole ratio application.

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