**Percentage by Mass a.k.a. Mass Percentage**

Don’t understand Mass Percentage. Well, neither did anyone else until they practiced it!

Apart from the guy who discovered the technique, he understood it fine.

**Note:**

** 1.** A ** mole **is a certain amount of atoms. In fact its 6.02214179×10

^{23 }(6 with 23 zeros after it) atoms. It follows that two moles would be 2 x (6.02214179×10

^{23}) atoms.

**2.** ** Molar Mass** is the total mass of the atoms if you only took

**of it, i.e. Carbon has a**

*1mol***of 12g, Oxygen 16g – the**

*molar mass***bigger**number on the periodic table. Another way to look at it is that 6.02214179×10

^{23}(6 with 23 zeros after it) Carbon atoms has a mass of 12g.

This guy has some good ideas.

So does this one.