Answer: 2HCl + CaCO3 => CaCl2+ CO2 + H2O
Step-by-step explanation:
The equation is now balanced.
2 atoms H in both reactant and product side.
Cl have 2 atoms on both sides.
Ca have 1 atom in both sides.
C have 1 atom on both sides and
O have 3 atoms on both reactant and product side