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

nmdcat.online July 13, 2026

During the decomposition reaction 2HgO → 2Hg + O₂, complete decomposition of 8 moles of HgO produces

A. 2 moles of O₂

B. 4 moles of O₂

✓

C. 6 moles of O₂

D. 8 moles of O₂

📝 Explanation

According to the balanced equation, 2 moles of HgO produce 1 mole of O₂. Therefore, 8 moles of HgO produce 4 moles of O₂. Concept tested: Stoichiometric calculations.

📖 Additional Information

2 moles of O₂
4 moles of O₂
6 moles of O₂
8 moles of O₂

According to the balanced equation, 2 moles of HgO produce 1 mole of O₂. Therefore, 8 moles of HgO produce 4 moles of O₂. Concept tested: Stoichiometric calculations.

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