Question

Help I don't get it what does this mean

Answer 1

so the first one is sodium chloride

second one is Magnesium oxide

Third one is Calcium hydroxide

Answer 2

You just have to write them in their word form;

1 - 3 molecules of sodium chloride.

2 - 4 molecules of magnesium oxide.

3 -
`(OH)^(2)` stands for "hydroxide" and can be added to many different molecules.

Hope it helped,

BioTeacher101