Number of molecules (Sec 3)

Mole is a unit.

It is like we all know one dozen is 12.

1 mol is 6 x 10^23.

That is all.

It is that straightforward.

1 mol of carbon dioxide molecules is 6 x 10^23.

But in that, there are 2 moles of oxygen atoms which gives us 2 x 6 x 10^23.

Simple logic. In 1 carbon dioxide molecule, there are 2 oxygen atom. So maturally, the number of oxygen atoms would be twice as much as the number of carbon dioxide molecules.

Think about it.