1. 10.1
Measuring Matter
Measuring Matter
What are three methods for measuring the amount of something?

2. 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?

3. 10.1
What is a Mole?
What Is a Mole?
How is Avogadro’s number related to a mole of any substance?

4. 10.1
What is a Mole?
A mole of any substance contains Avogadro’s number of representative particles, or 6.02  1023 representative particles.
The term representative particle refers to the species present in a substance: usually atoms, molecules, or formula units.

5. Converting Number of Particles to Moles
10.1
What is a Mole?
Converting Number of Particles to Moles
One mole (mol) of a substance is 6.02  representative particles of that substance and is the SI unit for measuring the amount of a substance.
The number of representative particles in a mole, 6.02  1023, is called Avogadro’s number.

6. 10.1
What is a Mole?

7. 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?

8. The Mass of a Mole of an Element
10.1
The Mass of a Mole of an Element
The atomic mass of an element expressed in grams is the mass of a mole of the element.
-The mass of a mole of an element is its molar mass.

9. for Sample Problem 10.4

10. The Mole–Mass Relationship
10.2
The Mole–Mass Relationship
The Mole–Mass Relationship
How do you convert the mass of a substance to the number of moles of the substance?

11. The Mole–Mass Relationship
10.2
The Mole–Mass Relationship
Use the molar mass of an element or compound to convert between the mass of a substance and the moles of a substance.

12. The Mole–Volume Relationship
10.2
The Mole–Volume Relationship
The Mole–Volume Relationship
What is the volume of a gas at STP?

13. The Mole–Volume Relationship
10.2
The Mole–Volume Relationship
Avogadro’s hypothesis states that equal volumes of gases at the same temperature and pressure contain equal numbers of particles.
In each container, the volume occupied by the gas molecules is small compared with the container’s volume, so the molecules are not tightly packed. a) The molecules in this container are small. b) This container can accommodate the same number of larger molecules.

14. The Mole–Volume Relationship
10.2
The Mole–Volume Relationship
The volume of a gas varies with temperature and pressure. Because of these variations, the volume of a gas is usually measured at a standard temperature and pressure.
Standard temperature and pressure (STP) means a temperature of 0°C and a pressure of kPa, or 1 atmosphere (atm).

15. The Mole–Volume Relationship
10.2
The Mole–Volume Relationship
At STP, 1 mol or, 6.02  1023 representative particles, of any gas occupies a volume of L.
The quantity 22.4 L is called the molar volume of a gas.
This box, with a volume of 22.4 L, holds one mole of gas at STP.

16. The Mole–Volume Relationship
10.2
The Mole–Volume Relationship
Calculating Volume at STP

17. 10.2
The Mole Road Map
The map shows the conversion factors needed to convert among volume, mass, and number of particles. Interpreting Diagrams How many conversion factors are needed to convert from the mass of a gas to the volume of a gas at STP?

18. 10.2
The Mole Road Map
The map shows the conversion factors needed to convert among volume, mass, and number of particles. Interpreting Diagrams How many conversion factors are needed to convert from the mass of a gas to the volume of a gas at STP?

19. 10.2
The Mole Road Map
The map shows the conversion factors needed to convert among volume, mass, and number of particles. Interpreting Diagrams How many conversion factors are needed to convert from the mass of a gas to the volume of a gas at STP?

20. The Mole Road Map 10.2 The Mole Road Map
The map shows the conversion factors needed to convert among volume, mass, and number of particles. Interpreting Diagrams How many conversion factors are needed to convert from the mass of a gas to the volume of a gas at STP?