The formula for magnesium oxide is MgO, showing that each formula unit of magnesium oxide contains one mole of magnesium ions. Therefore, if there is ample oxygen available, 4 moles of magnesium will form 4 moles of magnesium oxide.
Magnesium reacts violently with oxygen to make Magnesium Oxide
This is oxygen.
You cannot 'burn' MgO, it is refactory. I take it you mean burning Magnesium metal in oxygen - if so the answer is that the magnesium is oxidised to MgO and the oxygen is reduced - all reduction/oxidation ('redox') reactions are coupled - if something is oxidised the other is reduced.
From the formula, you have 2 atoms of Magnesium combine with one oxygen molecule to form 2 molecules of magnesium oxide. So when 4 magnesium atoms combine with two molecules of oxygen you get 4 magnesium oxide molecules. So from 4 moles of magnesium you get 4 moles of Magnesium oxide.
In any redox reaction, at least one reactant is reduced and at least one reactant is oxidized. In the reaction between magnesium and oxygen, the magnesium atoms are oxidized because they lose electrons and the oxygen atoms are reduced because they gain electrons. Furthermore, the premise of the question is erroneous: The reaction does not as alleged show only addition of oxygen; instead it shows combination of magnesium and oxygen to form a new chemical entity, the compound magnesium oxide.
MgO
The compound formula formed between magnesium and oxygen leads to the formation of magnesium oxide.The reaction for the above reaction can be represented as :2Mg(s) + O2(g) 2MgO(s)
340 grams
A white powdery substance is formed.It is Magnesium oxide which is formed by the reaction of magnesium with oxygen.
BaBr2
The compound formed by magnesium and oxygen is called magnesium oxide.
Magnesium reacts violently with oxygen to make Magnesium Oxide
MgO2
This is oxygen.
You cannot 'burn' MgO, it is refactory. I take it you mean burning Magnesium metal in oxygen - if so the answer is that the magnesium is oxidised to MgO and the oxygen is reduced - all reduction/oxidation ('redox') reactions are coupled - if something is oxidised the other is reduced.
Magnesium loss electrons and oxygen gain electrons.
Magnesium plus oxygen becomes magnesium oxide.