Determine how many moles of O2 are required to react completely with 7.4 mol C8H18 .

Question

Determine how many moles of O2O2 are required to react completely with 7.4 molmol C8H18C8H18. 

Answer 1

Assuming that we are dealing with a complete combustion reaction for C8H18, we would have the following balanced equation:

2 C₈H₁₈ + 25 O₂ ==> 16 CO₂ + 18 H₂O ... balanced equation

Using dimensional analysis, we can find mols of O2 needed

7.4 mol C₈H₁₈ x 25 mol O₂ / 2 mol C₈H₁₈ = 92.5 mols O₂ needed (93 mols to 2 sig.figs)