The number of moles of oxygen needed to react with 4.0 moles of Mg is:?

a. 1.0 moles b. 2.0 moles c. 3.0 moles d. 4.0 moles e. 5.0 moles

The number of moles of oxygen needed to react with 4.0 moles of Mg is:?
2 moles as each mole contains 2 oxygen atom
Reply:4 moles