CP Chemistry
Molar Mass Worksheet Answer Key
Name
Determine the molar mass (the mass of one mole) of each substance below.
1. KMnO4
Atom
Number
Atomic Mass
Subtotal
K
1
X
39.10
=
39.10
Mn
1
X
54.94
=
54.94
O
4
X
16.00
=
64.00
Molar Mass
158.03 g/mol
2. KCl
Atom
Number
Atomic Mass
Subtotal
K
1
X
39.10
=
39.10
Cl
1
X
35.45
=
35.45
Molar Mass
74.55 g/mol
3. Na2SO4
Atom
Number
Atomic Mass
Subtotal
Na
2
X
22.99
=
45.98
S
1
X
32.06
=
32.06
O
4
X
16.00
=
64.00
Molar Mass
142.04 g/mol
4. Calcium nitrate, Ca(NO3)2
Atom
Number
Atomic Mass
Subtotal
Ca
1
X
40.08
=
40.08
N
2
X
14.01
=
28.02
O
6
X
16.00
=
96.00
Molar Mass
164.09 g/mol
CP Chemistry
Molar Mass Worksheet Answer Key
Name
5. Al2(SO4)3
Atom
Number
Atomic Mass
Subtotal
Al
2
X
26.98
=
53.96
S
3
X
32.06
=
96.19
O
12
X
16.00
=
191.99
Molar Mass
342.15 g/mol
6. Ammonium phosphate, AlPO4
Atom
Number
Atomic Mass
Subtotal
Al
1
X
26.98
=
26.98
P
1
X
30.97
=
30.97
O
4
X
16.00
=
64.00
Molar Mass
121.95 g/mol
7. CuSO4•5H2O
Atom
Number
Atomic Mass
Subtotal
Cu
1
X
63.55
=
63.55
S
1
X
32.06
=
32.06
H
10
X
1.01
O
9
X
16.00
10.10
=
Molar Mass
144.00
249.61 g/mol
8. Mg3(PO4)2
Atom
Number
Atomic Mass
Subtotal
Mg
3
X
24.31
=
72.91
P
2
X
30.97
=
61.95
O
8
X
16.00
=
128.00
Molar Mass
262.86 g/mol
CP Chemistry
Molar Mass Worksheet Answer Key
Name
9. Zn(C2H3O2)2•2H2O
Atom
Number
Atomic Mass
Subtotal
Zn
1
X
65.39
=
65.39
C
4
X
12.01
=
48.04
H
10
X
1.01
=
10.10
O
6
X
16.00
=
96.00
Molar Mass
219.53 g/mol
10. Zn3(PO4)2•4H2O
Atom
Number
Atomic Mass
Subtotal
Zn
3
X
65.39
=
196.17
P
2
X
30.97
=
61.95
H
8
X
1.01
=
8.08
O
12
X
16.00
=
192.00
Molar Mass
458.20 g/mol
11. H2CO3
Atom
Number
Atomic Mass
Subtotal
H
2
X
1.01
=
2.02
C
1
X
12.01
=
12.01
O
3
X
16.00
=
48.00
Molar Mass
62.03 g/mol
12. Hg2Cr2O7
Atom
Number
Atomic Mass
Subtotal
Hg
2
X
200.59
=
401.18
Cr
2
X
52.00
=
104.00
O
7
X
16.00
=
112.00
Molar Mass
617.17 g/mol
CP Chemistry
Molar Mass Worksheet Answer Key
Name
13. Ba(ClO3)2
Atom
Number
Atomic Mass
Subtotal
Ba
1
X
137.33
=
137.33
Cl
2
X
35.45
=
70.90
O
6
X
16.00
=
96.00
Molar Mass
304.23 g/mol
14. Iron (III) sulfite, Fe2(SO3)3
Atom
Number
Atomic Mass
Subtotal
Fe
2
X
55.84
=
111.69
S
3
X
32.06
=
96.19
O
9
X
16.00
=
144.00
Molar Mass
15. Ammonium acetate, NH4C2H3O2
Atom
Number
Atomic Mass
351.88 g/mol
Subtotal
N
1
X
14.01
=
14.01
H
7
X
1.01
=
7.07
C
2
X
12.01
=
24.02
O
2
X
16.00
=
32.00
Molar Mass
77.10 g/mol