//for some reason Mr. Pham felt compelled to review the mole concept during the fourth week of Anal Chem
Pham: A mole is like dozen! Just like it mean count bunch of thing and figure it out, I have dozen orange it mean I have 12, one mole same thing but I have 6.022 times ten-23 orange! Is very big number! Why we use, because we need to can visually see something, not even counting, we don't care counting how many atom or molecule it is. If we use a dozen of sodium, can you weighing it? If there ten dozen carbon, it a lot! Can you weighing it? 100 dozen carbon, can you doing it? You cannot, it too small!