1. Molar Conversions Chap 3 & 7
Unit 6- The Mole:

2. Holy Mole!
What is a mole?
The mole is the SI unit for amount of substance.
Other SI units (time=sec, length=meter, mass=kg)

3. Holy Mole!
A mole (abbreviated mol) is the amount of a substance that contains as many particles as there are atoms in exactly 12 grams of carbon-12.

5. Mole, Mole, Mole A very amount!!!!
The mole is a counting unit (like a dozen, pair, case)
1 mol = 6.02  1023 items
(Items: atoms, molecules, formula units)
A very amount!!!!
LARGE

6. HOW LARGE IS IT???
1 mole of hockey pucks would equal the mass of the moon!
1 mole of basketballs would fill a bag the size of the earth!
1 mole of pennies would cover the Earth 1/4 mile deep!

7. A mole of a substance contains
NOT Avocado!!!
A mole of a substance contains
Avogadro’s number

8. Amedeo Avogadro
Italian Scientist

9. Avogradro’s # The best modern value is 6.0221367 × 1023
This means that exactly 12 g of carbon-12 contains × 1023 carbon-12 atoms.

10. Molar Mass Mass of 1 mole of an element or compound.
Found by looking at the ATOMIC MASS on the periodic table
Atomic mass tells the
atomic mass unit of an atom (amu)
unit: grams per mole (g/mol)
Round to 2 decimal places

11. Molar Mass Examples carbon 12.01 g/mol aluminum 26.98 g/mol zinc

12. Molar Mass Examples sodium 22.99 g/mol sulfur 32.07 g/mol krypton

13. Molar Mass Examples water sodium chloride H2O
2(1.01) = g/mol
NaCl
= g/mol

14. Molar Mass Examples sodium bicarbonate sucrose NaHCO3
(16.00) = g/mol
C12H22O11
12(12.01) + 22(1.01) + 11(16.00) = g/mol

15. Solve this: If you have 63 eggs, how many dozen of eggs are there
Solve this: If you have 63 eggs, how many dozen of eggs are there? (must use railroad tracks)
Roadmap: eggs  dozen
63 eggs
1 doz
12 eggs
= 5.25 doz

16. Molar Conversions 6.02  1023 molar mass (particles/mol) (mol/g) MOLESIN
GRAMS
MOLES
# of
PARTICLES
(molecules)
(g/mol)
(mol/particles)

17. Molar Conversion Examples
How many moles of carbon are in 26 g of carbon?
Road map: g  mol
26 g C
1 mol C
12.01 g C
= 2.2 mol C

18. Molar Conversion Examples
How many molecules are in 2.50 moles of C12H22O11?
Road map: mol  molecules
6.02  1023
molecules
1 mol
= 1.51  1024
molecules
C12H22O11
2.50 mol

19. Molar Conversion Examples
Find the mass of 2.1  1024 molecules of NaHCO3.
Roadmap: molecules  mols  grams
2.1  1024
molecules
1 mol
6.02  1023
molecules
84.01 g
1 mol
= 290 g NaHCO3