The Mole

Objective 3.02

What is a MOLE????

• An amount of a substance• A unit of measurement specific to

chemistry• mole• mol• n

The Mole

“like a dozen”

• Specific quantity• Does not change

• Avogadro’s Number: • The # of “things” in 1 mole• 6.022 x 1023

The Mole

How its used in Chemistry:

Elements are made up of _______________.

1 mole Cu = 1 mole Na = 1 mole O =

The Mole

How its used in Chemistry:

Compounds are made up of _____________.

1 mole NaCl = 1 mole LiOH = 1 mole CaF2 =

The Mole

How its used in Chemistry:

1 mole Ca3(PO4)2

* Subscripts = # of moles of the element in the compound

The Mole

How its used in Chemistry:

2 H2 + O2 2 H2O

* Coefficients = # of moles of a substance in a reaction

Molar Mass (Molecular Weight)

•1 mole of each substance has a “molar mass” – a specific weight

•It is the same as atomic mass only in g

•Ex: • 1 mole Na = • 1 mole C = • 1 mole Li =

•The units for molar mass are g/mol

Molar Mass (Molecular Weight)

•1 mole H2O = •1 mole NaCl = •1 mole Pb(NO3)2 =

Mole Conversion Review ProblemsConvert the following:1. 4.3g of calcium hydroxide into moles2. 0.82 moles of aluminum oxide into grams3. 7.90 x 1024 molecules of water into moles4. 2.56 moles of sodium carbonate into molecules5. 8.73 grams of beryllium bromide into molecules6. 3.17 x 1023 atoms of copper into grams of copper.7. How many atoms of iron are there in 5.6 moles of

iron (III) phosphate?8. What is the mass of cobalt in 0.31 moles of cobalt

(II) nitride?