Question

When 2.5 mol of O2 are consumed in this reaction how many moles of CO2 can be produced?

Answer 1

According to the reaction 8 mols of O2 produce 5 mols of CO2. Then we just need to write and use that as a conversion factor:

$2.5molsofO_2\times\frac{5molsofCO_2}{8molsofO_2}=1.5625molsofCO_2\text{ }$