Methanol has the chemical formula CH3OH. If 4 moles of methanol are combusted, how many moles of oxygen will be consumed?

The answer to your question is 6 moles of oxygen

Explanation:

Data

methanol = CH₃OH

number of moles = 4

moles of oxygen = ?

Process

1.- Write and balance the chemical reaction

                2CH₃OH  +  3O₂   ⇒    2CO₂    +   4H₂O

              Reactants     Elements       Products

                     2              Carbon               2

                     8             Hydrogen           8

                     8             Oxygen               8

2.- Calculate the moles of oxygen

                  2 moles of methanol 3 moles of oxygen

                  4 moles of methanol x

                  x = (4 x 3) / 2

                  x = 12/2

                 x = 6