Challenge 1
T. Trimpe 2008 http://sciencespot.net/
Use the formulas provided to determine the number of
atoms of each element in each compound.
1. CO2
2. H2O
3. Mg(OH)2
4. NaHCO3
5. H2SO4
List each element by symbol and
tell how many atoms there are in
the compound.
C = ____ O = ____
The answers are …
1. CO2
C=1 O=2
2. 2H2O
H=4 O=2
3. Mg(OH)2
Mg = 1 O = 2 H = 2
4. 3NaHCO3 Na = 3 H = 3 C = 3
5. 2H2SO4
H=4
S=2
O=8
O=9