2Mg + O2--->2MgO
If more oxygen is added, the amount of magnesium
a.will increase.
b.will decrease
c.will not change.
and why? Thanks for your help
Adding more O2 will increase the MgO for a system at equilibrium.
Based on the chemical equation 2Mg + O2 -> 2MgO, magnesium (Mg) reacts with oxygen (O2) to form magnesium oxide (MgO).
If more oxygen is added to the reaction, it means that the number of oxygen molecules (O2) in the reaction increases. According to the balanced equation, for every 2 moles of magnesium (2Mg), 1 mole of O2 is required to form 2 moles of magnesium oxide (2MgO).
Therefore, if more oxygen is added, it would mean that the reactant O2 is in excess. In this case, the amount of magnesium (Mg) available becomes the limiting reactant, meaning it will be fully consumed in the reaction before the extra oxygen is used up. Therefore, the amount of magnesium (Mg) that can react and form magnesium oxide (MgO) would decrease.
So, the correct answer is b. The amount of magnesium (Mg) will decrease if more oxygen is added.