How to determine the molecular weight of a pure substance

Question

Can you do it in four steps.

Answer 1

For example, the molecular formula for pure oxygen is O₂.

That means that there are two oxygen molecules in the molecular formula.

From the periodic table the atomic weight of Oxygen is 15.999.

Therefore the molecular weight of pure oxygen (O₂) is ( 2 x 15.999) which equals 31.998.