About _____________ Nm3 of air will be required for the complete combustion of 2Nm3 of CO?
Correct answer: D. 5
- A. 2
- B. 3
- C. 4
- D. 5
Explanation
Complete combustion follows CO + ½O₂ → CO₂, so 2 Nm³ of CO needs 1 Nm³ of oxygen. Since air contains about 21% oxygen by volume, the required air is 1/0.21 ≈ 4.8 Nm³, or about 5 Nm³.
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