A reactor is supplied with 12 moles of C, and it undergoes following reactions C + 0.5O2 -> CO and C + O2 -> CO2, if 4 moles of CO2 was produced and 4 moles of C remains unreacted, what are the number of moles of CO produced?

Correct Answer:
Extent of second reaction = (4 – 0)/1 = 4, => moles of C reacted in second reaction = 4*1 = 4, => moles of C reacted in first reaction = 12 – 4 – 4 = 4, => extent of first reaction = (0 – 4)/(-1) = 4, => moles of CO produced = 4*1 = 4.