The balanced equation for the combustion of one mole of magnesium is:
2Mg(s) + O₂(g) → 2MgO(s)
Now, if we identify the given equations as eq 1, eq 2, and eq 3, we have to do the following:
1) <em>Inverse eq 1 </em>and <em>multiply by 2</em>:
2MgCl₂(aq) + 2H₂O(l) → 2MgO(s) + 4HCl(aq)
2)<em>Multiply eq 2 by 2</em>
2Mg(s) + 4HCl(aq) → 2MgCl₂(aq) + 2H₂(g)
3) <em>Multiply eq 3 by 2</em>
2H₂(g) + O₂ → 2H₂O(l)
4) <em>Add eq 1, eq 2, and eq 3</em>
2MgCl₂(aq) + 2H₂O(l) → 2MgO(s) + 4HCl(aq)
2Mg(s) + 4HCl(aq) → 2MgCl₂(aq) + 2H₂(g)
<u>2H₂(g) + O₂ → 2H₂O(l) +</u>
2Mg(s) + O₂(g) → 2MgO(s)
Have a nice day!
#LearnwithBrainly