Chemistry NMDCAT MCQs Moles and Avogadro's Numbers
nmdcat.online July 2, 2026

The number of moles of carbon dioxide gas that occupy the same volume as 16 g of oxygen gas (O₂) at the same temperature and pressure is

A. 0.5 moles
B. 1 mole
C. 2 moles
D. 1.5 moles

📝 Explanation

Moles of O₂ = 16 ÷ 32 = 0.5 mole. By Avogadro's law, equal volumes of gases at the same temperature and pressure contain equal numbers of molecules. Therefore, the same volume of CO₂ also contains 0.5 mole.

📖 Additional Information

  • 0.5 moles
  • 1 mole
  • 2 moles
  • 1.5 moles

Moles of O₂ = 16 ÷ 32 = 0.5 mole. By Avogadro's law, equal volumes of gases at the same temperature and pressure contain equal numbers of molecules. Therefore, the same volume of CO₂ also contains 0.5 mole.

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