Calcium Carbonate + Hydrochloric Acid

Calcium Carbonate + Hydrochloric Acid ➜ Calcium Chloride
    + Carbon Dioxide + water
CaCO₃ + 2HCl ➜ CaCl₂ + CO₂ + H₂O

getting molecular weights:
(40+12+3•16) g of CaCO₃ + 2(1+35.5) g of HCl  ➜
   (40+2•35.5) g of CaCl₂  + (12+2•16) g of CO₂ + 18 g of H₂O
100 g of CaCO₃ + 73 g of HCl  ➜ 111 g of CaCl₂
   + 44 g of CO₂ + 18 g of H₂O