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A. What is the Mole?
A counting number (like a dozen)1 mol = 6.02 1023 particles“particles” may be atoms, molecules, formula units,
or ionsThe number 6.02 x 1023 (602 000 000 000 000 000 000
000 ) is called Avogadro’s number
A large amount!!!!
1 mole of hockey pucks would equal the mass of the moon!
A. What is the Mole?
1 mole of pennies would cover the Earth 1/4 mile deep!
1 mole of basketballs would fill a bag the size of the earth!
Now that we know…
1 mol = 6.02 x 1023 particlesWe must be able to recognize what type of
particles we’re dealing with based on the substance
Think back Elements (by themselves) =
Ionic Compounds =
Molecular Compounds =
atoms
Formula units
molecules
• The representative particle in a mole of water is the water molecule.
• 1 mol H2O = 6.02 x 1023 molecules H2O
• The representative particle in a mole of copper is the copper atom.
• 1 mol Cu = 6.02 x 1023 atoms Cu
• The representative particle in a mole of sodium chloride is the formula unit.
• 1 mol NaCl =6.02 x 1023
formula units NaCl
• The term “formula unit”is used to represent one“unit” of an ionic compound.
B. Molar Mass
Mass of 1 mole of an element or compound.
Atomic mass tells the... atomic mass units per atom (amu) grams per mole (g/mol)
B. Molar Mass Examples
water
sodium chloride
H2O
2(1.008) + (1)15.999 = ______ g/mol
NaCl (1)22.990 + (1)35.453 = _______ g/mol
B. Molar Mass Examples
sodium hydrogen carbonate
sucrose
NaHCO3
22.990 + 1.008 + 12.011 + 3(15.999)
= ______ g/mol
C12H22O11
12(12.011) + 22(1.008) + 11(15.999)
= ______ g/mol