1. Ch. 8 – The Mole
Molar Conversions

2. The Mole
Q: how long would it take to spend a mole of $1 coins if they were being spent at a rate of 1 billion per second?

3. A. What is the Mole? A large amount!!!! VERY
A counting number (like a dozen)
Avogadro’s number (NA)
1 mol = 6.02  1023 items
A large amount!!!!
VERY

4. A. What is the Mole? 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!

5. Just How Big is a Mole?
Enough soft drink cans to cover the surface of the earth to a depth of over 200 miles.
If you had Avogadro's number of unpopped popcorn kernels, and spread them across the United States of America, the country would be covered in popcorn to a depth of over 9 miles.
If we were able to count atoms at the rate of 10 million per second, it would take about 2 billion years to count the atoms in one mole.

6. The Mole 1 dozen cookies = 12 cookies
1 mole of cookies = 6.02 X 1023 cookies your turn:
1 dozen _______ = 12 _______
1 mole of ______ = ________________
1 dozen Al atoms = 12 Al atoms
1 mole of Al atoms = 6.02 X 1023 atoms
Note that the NUMBER is always the same, but the MASS is very different!
Mole is abbreviated mol (gee, that’s a lot quicker to write, huh?)

7. 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)
Round to 2 decimal places

8. Get out your periodic table

9. B. Molar Mass Examples carbon Oxygen Chlorine Hydrogen aluminum zinc
g/mol
g/mol
g/mol
g/mol
g/mol
g/mol

10. B. Molar Mass Examples water H2O 2(1.01) + 16.00 = 18.02 g/mol
sodium chloride
H2O
2(1.01) = g/mol
NaCl
= g/mol

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

12. Mg (NO3 )2 Magnesium nitrate Mg --------------=24.31g/mol
N x 2= 28.02
O x 6= 96.00
148.33g/mol

13. C. Molar Conversions molar mass 6.02  1023 MOLES (g/mol)IN
GRAMS
MOLES
NUMBER OF
PARTICLES
(g/mol)
(particles/mol)

16. 1. grams to moles How many moles of carbon are in 26 g of carbon?
26 g C
1 mol C
= 2.16 mol C
12.01 g C

17. 2. moles to grams
How many grams of carbon are in 2.16 moles of carbon?
2.16mol C
12.01g C
= 26 g C
1 mol C

18. 3. Moles to molecules
How many molecules are in 2.50 moles of C12H22O11?
1 mol
6.02  1023
molecules
2.50 mol
= 1.51  1024
molecules
C12H22O11

19. . 4. Atoms to moles
Find how many moles are in of 2.1  1024 atoms of Al
2.1  1024
atoms Al
1 mol Al
6.02  1023 atoms Al
= 3.49 moles Al

20. 5. Molecules to grams Find the mass of 2.1  1024 molecules of NaHCO3.
= 293 g NaHCO3

21. 6. grams to atoms
Find how many atoms are found in grams of Carbon.
12.01g C
6.02  1023 atoms
1 mol C
1 mol C
12.01g C =
6.02  atoms

22. 7. atoms to grams If you have atoms/molecules and want grams:
_____ (atoms) x mole of element x Molar mass of element
6.022 x 1023 atoms mole of element
= Grams of element

23. 1. Molar Conversion Examples
How many moles of carbon are in 26 g of carbon?
26 g C
1 mol C
12.01 g C
= 2.2 mol C

24. 2. Molar Conversion Examples
How many molecules are in 2.50 moles of C12H22O11?
6.02  1023
molecules
1 mol
2.50 mol
= 1.51  1024
molecules
C12H22O11

25. 3. Molar Conversion Examples
Find the mass of 2.1  1024 molecules of NaHCO3.
2.1  1024
molecules
1 mol
6.02  1023
molecules
84.01 g
1 mol
= 290 g NaHCO3

26. D. Chem Quest 1. Atomic mass unit = 1.6611  10 -24 grams Carbon
12.011amu
 10-24
grams
-24
amu
=1.9951x 10-23

27. D. Chem Quest 2. Carbon atoms Carbon atoms 12.011g 1.9951x 10-23 grams
= x 1023 atoms

28. D. Chem Quest 3. Mass of Phosphorus grams 30.973 amu 1.6611x 10-24 amu
= x grams

29. D. Chem Quest 4. Phosphorus atoms atoms 30.973grams 5.1449 x 10-23
= x atoms