2H2O + 2CaCl2 = 4HCl + 2Ca + O2
H = 4 H = 4
O = 2 Cl = 4
Ca = 2 Ca = 2
Cl = 4 O = 2
Note: Calcium Chloride's formula is CaCl2 not CaCl
Step by step process:
Oxygen(O) on the product has 2 coefficients which make the oxygen contain 2 atoms, however the oxygen on the reactant had only 1 atom;
H2O ← 2 H atoms + 1 O atom
therefore, to balance, I add 2 atoms beside H2O therefore it became,
2H2O ← 4 H atoms + 2 O atoms
you don't need to worry anymore on oxygen, but on the product, there's also a hydrogen.
HCl → 1 H atom + 1 Cl atom
to balance the hydrogen from both sides, I add 4 beside it.
4HCl → 4 H atoms + 4 Cl atoms
Hydrogen is done, but Chlorine now gains 4 atoms, so to balance again the equation, I add 2 beside the Chlorine on the reactant.
from, CaCl2 to 2CaCl2
2CaCl2 = 2 Ca atoms + 4 Cl atoms
Chlorine is also done, then the last problem is the Calcium which contains only 1 atom on the product, so to balance again the equation I add the same atoms I had with the same element on reactant to the product.
therefore from Ca it became 2Ca,
2Ca = 2 Ca atoms
Tip: For you to clearly and quickly analyze if it’s balanced, try to list down all the elements first and how much atoms they had by multiplying the coefficients beside them.
