Chemistry NMDCAT MCQs Moles and Avogadro's Numbers

nmdcat.online July 2, 2026

In the complete combustion of methane, CH₄ + 2O₂ → CO₂ + 2H₂O, the volume of oxygen required at STP to completely burn 2.5 moles of methane is

A. 22.4 dm³

B. 56.0 dm³

C. 112.0 dm³

✓

D. 5.6 dm³

📝 Explanation

The mole ratio of O₂ to CH₄ is 2:1. For 2.5 moles CH₄, moles of O₂ = 2.5 × 2 = 5.0 moles. At STP, 1 mole of gas occupies 22.4 dm³, so volume = 5.0 × 22.4 = 112.0 dm³.

📖 Additional Information

22.4 dm³
56.0 dm³
112.0 dm³
5.6 dm³

The mole ratio of O₂ to CH₄ is 2:1. For 2.5 moles CH₄, moles of O₂ = 2.5 × 2 = 5.0 moles. At STP, 1 mole of gas occupies 22.4 dm³, so volume = 5.0 × 22.4 = 112.0 dm³.

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