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

During the reaction 2H₂ + O₂ → 2H₂O, complete reaction of 44.8 L of oxygen at STP produces

A. 22.4 L of H₂O(g)
B. 44.8 L of H₂O(g)
C. 89.6 L of H₂O(g)
D. 67.2 L of H₂O(g)

📝 Explanation

At the same conditions of temperature and pressure, gas volumes follow mole ratios. One volume of O₂ produces two volumes of gaseous H₂O. Thus, 44.8 L O₂ forms 89.6 L H₂O(g). Concept tested: Gas volume ratios at STP.

📖 Additional Information

  • 22.4 L of H₂O(g)
  • 44.8 L of H₂O(g)
  • 89.6 L of H₂O(g)
  • 67.2 L of H₂O(g)

At the same conditions of temperature and pressure, gas volumes follow mole ratios. One volume of O₂ produces two volumes of gaseous H₂O. Thus, 44.8 L O₂ forms 89.6 L H₂O(g). Concept tested: Gas volume ratios at STP.

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