1. The Mole
Chap. 11
No, not that mole!

2. Counting Particles

3. Counting Particles
There are common units to count things

4. Counting Particles
There are common units to count things
Pair

5. Counting Particles There are common units to count things Pair = 2
Dozen

6. Counting Particles There are common units to count things Pair = 2
Dozen = 12
Ream

7. Counting Particles There are common units to count things Pair = 2
Dozen = 12
Ream = 500 sheets
Gross

8. Counting Particles There are common units to count things Pair = 2
Dozen = 12
Ream = 500
Gross = 144
‘Scop’ (not really)

9. Counting Particles There are common units to count things Pair = 2
Dozen = 12
Ream = 500
Gross = 144
‘Scop’ (not really) = 64
Mole

10. Counting Particles There are common units to count things Pair = 2
Dozen = 12
Ream = 500
Gross = 144
‘Scop’ (not really) = 64
Mole = Avogadro’s #

11. Avogadro’s number A value equal to 6.0221367 x 1023.
We’ll round it to: 6.02 x 1023

12. Counting Particles Converting with moles
Finding the number of particles from moles.

13. Self Check – Ex. 1
How many atoms are in 2 moles of helium?

14. Self Check – Ex. 2
How many molecules are in 7.5 moles of carbon dioxide?

15. Counting Particles Converting with moles
Finding the number of particles from moles.
Finding the number of moles from particles.

16. Self Check – Ex. 3
A sample of lead contains 1.5 x atoms. How many moles of lead atoms are there?

17. Self Check – Ex. 4
A sample of zinc chloride contains x formula units. How many moles of zinc chloride are there?

18. Massing a Mole
Different atoms have different masses.

19. 1 atom of carbon would weigh ____ times more than 1 atom of helium.3

20. 3 1 atom of carbon would weigh ____ times more than 1 atom of helium.
dozen atoms
1 atom of carbon would weigh ____ times more than 1 atom of helium. 3
dozen atoms

21. 3 1 atom of carbon would weigh ____ times more than 1 atom of helium.
mole of
1 atom of carbon would weigh ____ times more than 1 atom of helium. 3
mole of

22. Massing a Mole Different atoms have different masses.
The mass on the P.T. represents. . .

23. Massing a Mole Different atoms have different masses.
The mass on the P.T. represents. . .
The mass of 1 atom (in amu)

24. Massing a Mole Different atoms have different masses.
The mass on the P.T. represents. . .
The mass of 1 atom (in amu)
The mass of 1 mole of atoms (in grams)

25. Massing a Mole Different atoms have different masses.
The mass on the P.T. represents. . .
This value is called the molar mass.
The mass of 1 mole of particles

26. If you weigh out 40 grams of argon you have essentially counted ______________ atoms.

27. If you weigh out 40 grams of argon you have essentially counted ______________ atoms.
6.02 x 1023

28. Massing a Mole Calculating with molar mass
Using molar mass you can convert from to

29. Massing a Mole Calculating with molar mass
Using molar mass you can convert from grams to moles.

30. Self Check – Ex. 5
If a sample of aluminum has a mass 81.0 g how many moles are present?

31. Massing a Mole Calculating with molar mass
Using molar mass you can convert from grams to moles.
You can also convert from _____ to

32. Massing a Mole Calculating with molar mass
Using molar mass you can convert from grams to moles.
You can also convert from moles to grams.

33. Self Check – Ex. 6
What is the mass of moles of chromium?

34. Massing a Mole Calculating with molar mass
Calculating the molar mass of compound

35. One mole of CH4 contains:
Example
One mole of CH4 contains:
1 mole of carbon
moles of hydrogen

36. One mole of CH4 contains:
Example
One mole of CH4 contains:
1 mole of carbon
4 moles of hydrogen

37. One mole of CH4 contains:
Example
One mole of CH4 contains:
1 mole of carbon
4 moles of hydrogen
weighs 12 g
weighs ______

38. One mole of CH4 contains:
Example
One mole of CH4 contains:
1 mole of carbon
4 moles of hydrogen
weighs 12 g
weighs 4 x (1) g

39. One mole of CH4 contains:
Example
One mole of CH4 contains:
1 mole of carbon
4 moles of hydrogen
weighs 12 g
weighs 4 x (1) g
= 16 g/mol

40. Massing a Mole Calculating with molar mass
Calculating the molar mass of compound
Add the masses of each of the atoms in the compound.

41. Massing a Mole Calculating with molar mass
Calculating the molar mass of compound
Add the masses of each of the atoms in the compound.
Remember to multiply each atom’s mass by the number atoms in the compound.

42. Self Check – Ex. 7
What is the molar mass of lithium nitrate, LiNO3?

43. Self Check – Ex. 8
What is the molar mass of calcium acetate, Ca(C2H3O2)2?

44. Multiple step conversions
Just remember the mole is the central unit

45. (atoms, molecules, formula units)
Mass
(grams)
Volume
(liters)
MOLE
particles
(atoms, molecules, formula units)

46. Self Check – Ex. 12
How many molecules of ammonia, NH3 are in a 68-g sample?

47. The end.