Pure carbon is completely burnt in oxygen. The flue gas analysis is 70%CO2, 20%CO and 10%O2. The percent excess oxygen used is __________________?
Correct answer: C. 0
- A. 20
- B. 12.5
- C. 0
- D. 10
Explanation
On a 100-mole flue-gas basis, 70 mol CO₂ and 20 mol CO represent 90 mol of carbon, requiring 90 mol O₂ for complete combustion. The supplied oxygen is 70 + 10 + 10 = 90 mol, so there is no excess oxygen.
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