 “Mole” derives from Latin meaning “pile” or “heap”

 How many are in: ◦ 1 doz? ◦ 2 doz? ◦ ½ doz? ◦ ¼ doz?

 Carbon has a mass of 12 g  Oxygen has a mass of 16 g  H 2 O molecules has a mass of 18 g  How do these #’s relate to the atom or compound? ◦ Atomic mass

 Amedeo Avogadro ( )  1 mole = x ◦ Particles ◦ Molecules ◦ Atoms ◦ Ions ◦ Formula units ◦ Etc, etc

 If we stack 6.02 x pennies on top of one another, the stack of pennies would reach the sun and back almost 500 million times!  AN of marbles spread over the surface of the earth would produce a layer of marbles about 50 miles thick!  If the worlds entire population of 7 billion people, counting at the rate of one per second collectively counted to AN, it would take 3 million years to get there!

 1 mol of Fe = grams  1 mol H 2 = grams  1 mol CO 2 = = 44 grams  Molar mass is grams per mole ◦ Similar to miles per hour

 What would the mass in grams of 3.50 moles of Cu atoms be? 222 g Cu

128.7g NaCl

 How many moles are in grams of phosphorous? mole of P

 Now, how many atoms of phosphorous would that be? x atoms of P ** remember 1 mol = 6.02 x atoms**

 How many moles is 1.20x10 23 atom of Zn? mol of Zn

 What is the mass (in grams) of 1.20 x atoms of Zn? (use answer from last problem) 13.0 g of Zn

 How many atoms are in grams of Zn? 6.90 x atoms of Zn