Simple, yet logical.

So, I've asked Mr. Ng some questions in the email. It's as below.

Overall, I am very confused with mole, molecules and everything. [Molar mass = mass of one mole]?

This is what Mr. Ng replied me.

Quite simple actually.

1 mole contains N_A number of molecules

The mass of 1 mole is M gram. (Be careful not kg) where M is the molar mass.

Most of the time g need to be converted to kg before they can be used in the formula ( SI unit)

That takes care of the first two questions which is the most difficult.

The question of everything is the simplest. You simply wouldn’t be able to understand it. Neither could I. Or anyone else I met.

(Haha.. This made me smile. Thanks for answering the last question, too)