In chemistry, there is a unit of measure called the mole. It represents 6.02x1023 of anything, in the same way that a dozen represents 12 of anything. There is a link to a video that explains this on the unit 3 page of the site. It is called "Avogadro Calculations Video 1".
Homework: Read p.176, 178; answer p.177 #13, 14, 16; p.178 #19, 20, 22
Homework: Read p.176, 178; answer p.177 #13, 14, 16; p.178 #19, 20, 22