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given the reaction, fe2o3 + 3 co 2 fe + 3 co2, if 12.0 moles of co2 are made, then how many moles of co were used?

12.0 moles

6.0 moles

4.0 moles

3.0 moles

4.0 moles were used. hope ive helped you! please rate brailiest. :)

The answer should be A. 12 moles

(All numbers you see are GIVEN from the equation)
12molCO2/1 * 3molCO/3mol CO2
All you have to do is multiply 3 and 12 then divide by 3 to get 12moles 

Nonmetals usually react by gaining electrons

Butterfly wingspan is 7.7