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Chemistry NMDCAT MCQs Moles and Avogadro's Numbers Moles and Avogadro’s Numbers
nmdcat.online July 13, 2026

During the combustion reaction 2H₂ + O₂ → 2H₂O, complete reaction of 44.8 L of hydrogen gas at STP requires

A. 11.2 L of O₂
B. 22.4 L of O₂
✓
C. 33.6 L of O₂
D. 44.8 L of O₂

📝 Explanation

According to the balanced equation, 2 volumes of H₂ react with 1 volume of O₂. Therefore, 44.8 L H₂ requires 22.4 L O₂. Concept tested: Gas volume ratios at STP.

📖 Additional Information

  • 11.2 L of O₂
  • 22.4 L of O₂
  • 33.6 L of O₂
  • 44.8 L of O₂

According to the balanced equation, 2 volumes of H₂ react with 1 volume of O₂. Therefore, 44.8 L H₂ requires 22.4 L O₂. Concept tested: Gas volume ratios at STP.

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