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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 

The  grandmother cell  is a hypothetical  neuronthat represents a complex but specific concept or object.[1]  it activates when a person "sees, hears, or otherwise sensibly discriminates"[2]  a specific entity, such as his or her grandmother. the term was in use at least as early as 1966 amongst staff and students in the department of experimental psychology, university of cambridge, england. a similar concept, that of the  gnostic neuron, was proposed two years later