Hey there!
MnO₂ + HCl → MnCl₂ + H₂O + Cl₂
Balance Cl.
1 on the left, 4 on the right. Add a coefficient of 4 in front of HCl.
MnO₂ + 4HCl → MnCl₂ + H₂O + Cl₂
Balance H.
4 on the left, 2 on the right. Add a coefficient of 2 in front of H₂O.
MnO₂ + 4HCl → MnCl₂ + 2H₂O + Cl₂
Balance O.
2 on the left, 2 on the right. Already balanced.
Balance Mn.
1 on the left, 1 on the right. Already balanced.
Our final balanced equation:
MnO₂ + 4HCl → MnCl₂ + 2H₂O + Cl₂
Hope this helps!
