Converting between Atoms/Molecules & Moles!

It takes one step to convert from Moles to Molecules and two steps from Moles to Atoms.

Moles to Molecules:
The conversion factor for moles to molecules is Avogadro's number (6.02 x 10^2)

Example:
How many water molecules are there in 0.65mol?

Step 1: Lay down conversion equation.
0.65mol x 6.02x10^23molec / 1mol = ???
Step 2: Multiply by Avogadro's number and divide by 1mol (to cancel the mol).
0.65mol x 6.02x10^23molec / 1mol = 3.9x10^23 molec

Moles to Atoms:
Convert Moles to Molecules first by using Avogadro's number as a conversion factor then use subscripts

Example:
How many oxygen atoms are in 3.9x10^23molec?

Step 1: Lay down conversion equation.
3.9x10^23molec x 2atoms/1mol = ???

Step 2: Multiply the molecules by the number of subscripts.
3.9x10^23molec x 2atoms/1mol = 7.8x10^30 oxygen atoms.