A)perclorato de bario = Ba(ClO4)2
Ba : 1 x 137 = 137 g / mol
Cl = 2 x 35.
5 = 71 g / mol
O : 8 x 16 = 128 g / mol
```````````````````````````````` Mm = 336 g / mol
b) MgSO4
Mg : 1 x 24 = 24 g / mol
S : 1 x 32 = 32 g / mol
O : 4 x 16 = 64 g / mol
```````````````````````````` Mm = 120 g / mol
c) PbCl2
Pb : 1 x 207 = 207 g / mol
Cl : 2 x 35.
5 = 71 g / mol
```````````````````````````````` Mm = 278 g / mol
d) Cu(NO3)2
Cu : 1 x 63.
5 = 63.
5 g / mol
N : 2 x 14 = 28 g / mol
O : 6 x 16 = 96 g / mol
```````````````````````````````` Mm = 187.
5 g / mol
e) SnCl4
Sn : 1 x 118.
7 = 118.
7 g / mol
Cl : 4 x 35.
5 = 142 g / mol
```````````````````````````````````` Mm = 260.
7 g / mol
f) C6H6O
C : 6 x 12 = 72 g / mo
H : 6 x 1 = 6 g / mol
O ; 1 x 16 = 16 g / mol
```````````````````````````` Mm = 94 g / mol
g) (NH4)2S
N : 2 x 14 = 28 g / mol
H : 8 x 1 = 8 g / mol
S : 1 X 32 = 32 g / mol
`````````````````````````````` Mm = 68 g / mol
h) C6HOCI2
C : 6 x 12 = 72 g / mol
H : 1 x 1 = 1 g / mol
O : 1 x 16 = 16 g / mol
Cl : 2 x 35.
5 = 71 g / mol
`````````````````````````````````` Mm = 160 g / mol
i) BaH2
Ba : 1 x 137 = 137 g / mol
H : 2 x 1 = 2 g / mol
```````````````````````````````` Mm = 139 g / mol
j) KH2PO4
K : 1 x 39 = 39 g / mol
H : 2 x 1 = 2 g / mol
P : 1 x 31 = 31 g / mol
O : 4 x 16 = 64 g / mol
```````````````````````````````````` Mm = 136 g / mol
k) K2HPO4
K : 2 x 39 = 78 g / mol
H : 2 x 1 = 2 g / mol
P : 1 x 31 = 31 g / mol
O : 4 x 16 = 64 g / mol
```````````````````````````````````` Mm = 175 g / mol
l) K3PO4
K : 3 x 39 = 117 g / mol
P : 1 x 31 = 31 g / mol
O : 4 x 16 = 64 g / mol
```````````````````````````````````` Mm = 212 g / mol.