Directions: Record the number of each atom in each molecule, then record the total number of atoms in the molecule.

Total number of atoms = 5
The formula of a compound shows the composition of the constituent elements
CaCO₃ is composed of 3 types of atoms, namely Ca, C and O
The amounts of each of these atoms in the compound CaCO₃:
Then total number of atoms :
[tex]\tt 1+1+3=5[/tex]