Hallar el peso melecular de los siguientes elementos , dióxido de carbono , acido sulfurico , oxido ferroso ?

Dióxido de carbono : CO2

C : 1 x 12 = 12 g / mol

O : 2 x 16 = 32 g / mol

````````````````````````````` PM = 44 g / mol

ácido sulfúrico : H2SO4

H : 2 x 1 = 2 g / mol

S : 1 x 32 = 32 g / mol

O : 4 x 16 = 64 g / mol

`````````````````````````````` PM = 98 g / mol

óxido ferroso : FeO

Fe : 1 x 56 = 56 g / mol

O : 1 x 16 = 16 g / mol

```````````````````````````````` PM = 72 g / mol

hidruro de aluminio : AlH3

Al : 1 x 27 = 27 g / mol

H : 3 x 1 = 3 g / mol

````````````````````````````````` PM = 30 g / mol

ácido fosfórico : H3PO4

H : 3 x 1 = 3 g / mol

P : 1 x 31 = 31 g / mol

O : 4 x 16 = 64 g / mol

`````````````````````````````` PM = 98 g / mol.