When pure carbon is burned in air, some of it oxidizes into CO2 and some to CO. The molar ratio of N2 to O2 is 7.18 and the ratio of CO to CO2 is 2.0 in the product gas. What is the percent excess air used? The exit gases contain only N2, O2, CO and CO2.

When pure carbon is burned in air, some of it oxidizes into CO2 and so

1.	When pure carbon is burned in air, some of it oxidizes into CO₂ and some to CO. The molar ratio of N₂ to O₂ is 7.18 and the ratio of CO to CO₂ is 2.0 in the product gas. What is the percent excess air used? The exit gases contain only N₂, O₂, CO and CO₂.
A.	50 %
B.	60 %
C.	40 %
D.	20 %
Answer» D. 20 %