1. The Mole: A Measurement of Matter
10.1
The Mole: A Measurement of Matter
You could measure the amount of sand in a sand sculpture by counting each grain of sand, but it would be much easier to weigh the sand. You’ll discover how chemists measure the amount of a substance using a unit called a mole, which relates the number of particles to the mass.

2. 10.1
Measuring Matter
Measuring Matter
What are three methods for measuring the amount of something?

3. 10.1
Measuring Matter
You often measure the amount of something by one of three different methods—by count, by mass, and by volume.
You can buy items by different types of measurements, such as a count, a weight or mass, or a volume. Classifying Which of these common items are being sold by weight? By volume? By count?

4. 10.1
What is a Mole?
What Is a Mole?
How is Avogadro’s number related to a mole of any substance?

5. 10.1
What is a Mole?
A mole of any substance contains Avogadro’s number of representative particles, or 6.02  1023 representative particles.
1 mole = 6.02 x RP

6. 10.1
What is a Mole?

7. Converting Number of Particles to Moles
10.1
What is a Mole?
Converting Number of Particles to Moles

8. Converting Number of Particles to Moles
10.1
What is a Mole?
Converting Number of Particles to Moles
How many moles are in each of the following:
x 1024 atoms Al

9. Converting Number of Particles to Moles
10.1
What is a Mole?
Converting Number of Particles to Moles
x 1024 molecules of CO2

10. Converting Number of Particles to Moles
10.1
What is a Mole?
Converting Number of Particles to Moles
x 1023 formula units ZnCl2

11. Converting Number of Particles to Moles
10.1
What is a Mole?
Converting Number of Particles to Moles
x 1020 atoms Fe

12. 10.2

13. Converting Moles to Number of Particles
10.1
What is a Mole?
Converting Moles to Number of Particles
X unit of unknown = given x Conversion Factor
conversion factor= 1 mole = 6.02 x 1023 Representative
particles

14. Converting Moles to Number of Particles
10.1
What is a Mole?
Converting Moles to Number of Particles
Determine the number of atoms in 2.50 mol Zn.

15. Converting Moles to Number of Particles
10.1
What is a Mole?
Converting Moles to Number of Particles
Given 3.25 mol of AgNO3, determine the number
of formula units.

16. Converting Moles to Number of Particles
10.1
What is a Mole?
Converting Moles to Number of Particles
3. Calculate the number of molecules in 11.5 mol H2O

17. The Mass of a Mole of an Element
10.1
The Mass of a Mole of an Element
The Mass of a Mole of an Element
How is the atomic mass of an element related to the molar mass of an element?

18. The Mass of a Mole of an Element
10.1
The Mass of a Mole of an Element
The atomic mass of an element is numerically equal to the molar mass of an element.

19. The Mass of a Mole of a Compound
10.1
The Mass of a Mole of a Compound
The Mass of a Mole of a Compound
How is the mass of a mole of a compound calculated?

20. The Mass of a Mole of a Compound
10.1
The Mass of a Mole of a Compound
To calculate the molar mass of a compound, find the number of grams of each element in one mole of the compound. Then add the masses of the elements in the compound.

21. The Mass of a Mole of a Compound
10.1
The Mass of a Mole of a Compound
Substitute the unit grams for atomic mass units. Thus 1 mol of SO3 has a mass of 80.1 g.

22. 10.4

23. 10.4

24. 10.4

25. 10.4

26. for Sample Problem 10.4
Problem Solving 10.7 Solve Problem 7 with the help of an interactive guided tutorial.

27. 10.1 Section Quiz.
10.1.

28. 10.1 Section Quiz.
1. Three common ways of measuring the amount of something are by count, by mass, and
by temperature.
by volume.
by area.
by density.

29. 10.1 Section Quiz.
2. A mole of hydrogen gas, H2(g), contains x 1023
molecules.
atoms.
amu.
grams.

30. 10.1 Section Quiz.
3. The atomic mass of fluorine is 19.0 amu, so the molar mass is
19.0 amu.
19.0 g.
6.02 x 1023 amu.
6.02 x 1023 g.

31. 10.1 Section Quiz.
4. Calculate the molar mass of ammonium nitrate.
45.02 g
80.05 g
60.06 g
48.05 g

32. END OF SHOW