O2
Name _____________________
Counting Atoms Worksheet
Subscript = 2
1) write down the different elements in each compound.
2) write down how many of that particular atom there are
3) how many atoms are there total in the compound.
Coefficient = 3
3 O2
Examples:
A) MgCl2
2 - Mg
2 - Cl
total atoms
B) 4 HBr
4- H
4 - Br
total atoms
1) N2
H2O
- nitrogen gas
subscript = ____
C) 3 H2O
D) 5 ZnSO4
8)
3 x ___ = ___H
3 x ___ = ___ O
total atoms
5 x ___ = ___ Zn
5 x ___ = ___ S
5 x ___ = ___ O
total atoms
2 NaOH
total atoms
2) 3 N2
total atoms
- nitrogen gas coefficient = ____
9)
Li2SO4
total atoms
3) N2O3
subscripts = ___&___
total atoms
total atoms
4) 2 NO
10)
3 Li2SO4
coefficient = ____
total atoms
total atoms
5)
MgCl2
11)
6)
4 MgCl2
total atoms
coefficient = ____
12)
coefficient = ____
total atoms
4 Al2O3
total atoms
total atoms
7) 3 Li2O
5 H2O
subscript = ____
total atoms
13)
3 H2O
3 NH4Cl
total atoms
14)
21)
7 C 2S 2
total atoms
15)
4 Al(OH)3
total atoms
22)
total atoms
16)
4 Mg(OH)2
2 Sr3(PO4)2
23)
4 Al2(SO3)3
3 Li2SO4
total atoms
24)
5 H2O
total atoms
total atoms
18)
Li2SO4
total atoms
total atoms
17)
2 NaOH
25)
4 Al2O3
total atoms
total atoms
19)
26)
3 NH4Cl
Ca (C2H3O2)2
total atoms
total atoms
20)
2 (NH4)3PO4
total atoms
SUPER STAR CHALLENGE!
13)
14)
16)
17)
15)
18)