Mg + O2(o is a diatomic element)⇒ Mg O(UNBALANCED) Mg is +2, o is -2, so MgO is the product. BALANCED EQUATION : 2Mg + O2 ⇒ 2MgO There are 4 moles of magnesium, so there should be 4/2*2=4 moles of oxygen, and the product will have 4+4=8 moles. there will be 8 moles of magnesium oxide.
