Question

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-

Answer 1

Step-by-step explanation:

To find the number of atoms in each specie, we consider the coefficient and the subscript of each of the given atoms.

1. NaCl:

Na = 1 atom

Cl = 1 atom

2. CO₂

C = 1 atom

O = 2 atom

3. O₂

O = 2 atoms

4. C₆H₁₂O₆

C = 6 atoms

H = 12 atoms

O = 6 atoms

For the second part;

1. 2NaCl

Na = 2 atoms

Cl = 2 atoms

2. 3CO₂

C = 3 atoms

O = 6 atoms

3. 4O₂

O = 8 atoms

4. 2C₆H₁₂O₆

C = 12 atoms

H = 24 atoms

O = 12 atoms