How many grams of co are needed to react with an excess of fe2o3 to produce (210.3 g fe) 209.7 g fe? show your work.
co (g) + fe2o3 (s) --> fe (s) + co2 (g)

Explanation:

1)Mass of CO when 210.3 g of Fe produced.

Number of moles of in 210.3 g=

According to reaction, 2 moles of Fe are obtained from 3 moles of CO, then 3.76 moles of Fe will be obtained from : of CO that is 5.64 moles.

Mass of CO in 5.64 moles =

2)Mass of CO when 209.7 g of Fe produced.

Number of moles of in 209.7 g=

According to reaction, 2 moles of Fe are obtained from 3 moles of CO, then 3.75 moles of Fe will be obtained from : of CO that is 5.625 moles.

Mass of CO in 5.625 moles =

58750.08068 is the answer i think