1. Atomic mass
The atomic mass is the average mass of an atom.

2. When using atomic masses make sure to round to at least one decimal place.

3. What is the atomic mass of actinium (Ac)?
227.0

4. What is the atomic mass of hydrogen (H)?
1.0

5. What is the mass of hydrogen (H2)?
2.0

6. Vitamin A: C20H30O
The first of the 13 vitamins to be discovered, it plays a vital role in the growth and repair of body tissues, and is particularly important in maintaining good eyesight and healthy skin, as well as aiding in bone and teeth formation.
Vitamin A-rich foods include: Liver, sweet potatoes, carrots, mangoes, spinach, cantaloupe, dried apricots, milk, egg yolks, mozzarella cheese.

7. Determine the Molecular Mass of Vitamin A
C20H30O
20 x 12.0 =
30 x 1.0 =
1 x =
= amu

8. H H2O NaCl H is an atom and it would therefore have an atomic mass.
H2O is a molecule and it would therefore have a molecular mass.
NaCl is neither an atom or a molecule and would therefore have a formula mass.

9. Formula Mass The formula mass is the mass of an ionic compound.
An ionic compound is formed from a combination of metals and nonmetals.
Formula masses are calculated the same as molecular masses.

10. Determine the Formula Mass of Calcium Phosphate
Ca3(PO4)2
3 x = 120.3
2 x =
8 x = 128.0
= amu

11. Chapter 8: The Mole – Part 1

12. What is Avogadro’s favorite saying from American History?

14. The Mole
A mole is Avogadro’s number of particles, that is 6.02 × 1023 particles.
1 mol = Avogadro’s Number
= 6.02 × 1023 particles

15. How Big is a Mole?
Where would you need to go to see 1 mole of rice grains?

16. How Big is a Mole?
1 mole of rice grains is more than the number of rice grown since the beginning of time?

17. How Big is a Mole?
The worlds fastest supercomputer can count the world’s population in ¼ second. How long would it take this computer to count to 1 mole?

18. How Big is a Mole?
The worlds fastest supercomputer can count the world’s population in ¼ second. It would take this computer 1.9 million years to count to 1 mole?

19. How Big is a Mole? One mole of marbles would cover the entire Earth
(oceans included) for a depth of three miles.
One mole of $100 bills stacked one on top of another
would reach from the Sun to Pluto and back 7.5 million
times.
6.02 x 1023 softballs = volume of Earth
6.02 x 1023 Olympic shot puts = mass of Earth
6.02 x 1023 atoms H laid side by side would encircle Earth ~1,000,000 times
It would take light 9500 years to travel from the
bottom to the top of a stack of 1 mole of $100 bills.

20. How Big is a Mole?
Where would you need to go to see 1 mole of water.

21. World’s Fastest Super Computer vs. Super Teacher

22. The Marble Contest

23. What is the mass in grams of exactly 1 mole of water?
1.66 x g/amu
1 mol H2O

24. What is the mass in grams of exactly 1 mole of water?
1.66 x g/amu
1 mol H2O
6.02 x 1023 H2O molecules
mol H2O

25. What is the mass in grams of exactly 1 mole of water?
1.66 x g/amu
1 mol H2O
6.02 x 1023 H2O molecules
18.0 amu
mol H2O
molecule H2O

26. What is the mass in grams of exactly 1 mole of water?
1.66 x g/amu
1 mol H2O
6.02 x 1023 H2O molecules
18.0 amu
1.66 x g
mol H2O
molecule H2O
amu

27. What is the mass in grams of exactly 1 mole of water?
1.66 x g/amu
1 mol H2O
6.02 x 1023 H2O molecules
18.0 amu
1.66 x g
mol H2O
molecule H2O
amu
= 18.0 g

29. 1 mol H2O = 18.0g This is the gram formula mass of water.
This is the molar mass of water.
The gram formula mass (molar mass) is the molecular mass of the substance in grams.

30. What is the mass of 1 mol sucrose (C12H22O11)

31. 1 mol sucrose (C12H22O11) = 342.0g 12 x 12.0 = 144.0 22 x 1.0 = 22.0
gfm = g

32. Homework Molecular and Formula Mass Worksheet (due in two days).
Don’t forget to show your work on your calculations.

33. Why 6.02 x 1023
How did scientists come up with such a random number for the mole?
It’s really not random at all. It is really just based on a ratio that you already know.
1.66 x g/amu.

34. Why 6.02 x 1023
How many atoms are in exactly one mole of carbon?

35. Why 6.02 x 1023 How many atoms are in exactly one mole of carbon?
1 mol C

36. Why 6.02 x 1023 How many atoms are in exactly one mole of carbon?
1 mol C g C
mol

37. Why 6.02 x 1023 How many atoms are in exactly one mole of carbon?
1 mol C g C 1 amu
mol x g

38. Why 6.02 x 1023 How many atoms are in exactly one mole of carbon?
1 mol C g C 1 amu C atom
mol x g 12.0 amu

39. Why 6.02 x 1023 How many atoms are in exactly one mole of carbon?
1 mol C g C 1 amu C atom
mol x g 12.0 amu
= 6.02 x 1023 C atoms/mol

40. Why 6.02 x 1023 How many atoms are in exactly one mole of carbon?
1 mol C g C 1 amu C atom
mol x g 12.0 amu
= 6.02 x 1023 C atoms/mol

41. Why 6.02 x 1023 How many atoms are in exactly one mole of carbon? 1

42. Why 6.02 x 1023
How many molecules are in exactly one mole of water?

43. Why 6.02 x 1023 How many molecules are in exactly one mole of water?
1 mol H2O

44. Why 6.02 x 1023 How many molecules are in exactly one mole of water?
1 mol H2O g H2O
mol

45. Why 6.02 x 1023 How many molecules are in exactly one mole of water?
1 mol H2O g H2O amu
mol H2O x g

46. Why 6.02 x 1023 How many molecules are in exactly one mole of water?
1 mol H2O 18.0 g H2O 1 amu H2O molecule
mol x g amu

47. Why 6.02 x 1023 How many molecules are in exactly one mole of water?
1 mol H2O 18.0 g H2O 1 amu H2O molecule
mol x g amu
= 6.02 x 1023 H2O molecules/mol

48. Why 6.02 x 1023 How many molecules are in exactly one mole of water?
1 mol H2O 18.0 g H2O 1 amu H2O molecule
mol x g amu
= 6.02 x 1023 H2O molecules/mol

49. Why 6.02 x 1023 How many molecules are in exactly one mole of water? 1