To see how many atoms are in the chemical formula or element symbol, look at the subscript. Example: Hz
There are two Hydrogens.
H2O
There is one Oxygen. No subscript means one.
Directions: Find the number of atoms in each chemical formula.
1. NaCl (sodium chloride or table salt)
Na-
CI-

2. CO2 (carbon dioxide)
C-
0-

3. O2 (oxygen)
0-

4. CoH1206 (glucose)
C-
H-
0-

To see how many atoms are in the chemical formula or element symbol, look at the subscript.

When there's a COEFFICIENT, multiply the coefficient by each subscript.
Example: 2H2O1
20102

Directions: Find the number of atoms in each chemical formula.

5. 2NaCl (sodium chloride or table salt)
Na
CH-

6.3C02 (carbon dioxide)
C.
0-

7.402 (oxygen)
0-

8. 2C6H12O6 (glucose)
c
H-
0-