1 / 31

# Chapter 10 - PowerPoint PPT Presentation

Chapter 10. Chemical Quantities. Chapter 10.1 The Mole: A Measurement of Matter. A. Measuring Matter. Statement Chemistry is a quantitative science. 2. What is one way to measure matter? One way to measure matter is to count how many of something you have. 3. Statement

I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

### Chapter 10

Chemical Quantities

Chapter 10.1 The Mole:A Measurement of Matter

A. Measuring Matter

• Statement

Chemistry is a quantitative science.

2. What is one way to measure matter?

One way to measure matter is to count how many of something you have.

3. Statement

Knowing how the count, mass, and volume of an item relate to a common unit allows you to convert among these units.

This is called Dimensional Analysis.

A. Measuring Matter

Chapter 10.1 The Mole:A Measurement of Matter

Sample Problem 10.1

What is the mass of 90 average-size apples if 1 dozen of the apples has a mass of 2.0 Kg?

(15 Kg)

Do the problems 1 and 2 at the bottom of page 307.

Chapter 10.1 The Mole:A Measurement of Matter

B. What is a Mole?

• How do chemists count the number of atoms, molecules, or formula units in a substance?

The chemists use a unit that is a specified number of particles. The unit is called the mole.

2. What is a mole?

It represents 6.02 x 1023 particles of that substance.

It is the SI unit for measuring the amount of a substance.

B. What is a Mole?

Chapter 10.1 The Mole:A Measurement of Matter

B. What is a Mole?

3. What is the name of number of representative particles in a mole?

It was named in honor of the Italian scientist Amedeo Avogadro di Quaregna, who helped clarify the difference between atoms and molecules.

4. What does the term representative particle mean?

It refers to the species present in a substance, usually atoms, molecules, or formula units.

B. What is a Mole?

Chapter 10.1 The Mole:A Measurement of Matter

B. What is a Mole?

5. Statement

The mole allows chemists to count the number of representative particles in a substance.

6. Converting between Number of Particles and Moles

1 mole = 6.02 x 1023 particles

B. What is a Mole?

Chapter 10.1 The Mole:A Measurement of Matter

Sample Problem 10.2

Converting Number of Atoms to Moles

Magnesium is a light metal used in the manufacture of aircraft, automobile wheels, and tools. How many moles of magnesium is 1.25 x 1023 atoms of magnesium?

Do Problems 3 and 4 at the bottom of Page 309.

Chapter 10.1 The Mole:A Measurement of Matter

Sample Problem 10.3

Converting Moles to Number of Atoms

Propane is a gas used for cooking and heating. How many atoms are in 2.12 moles of propane (C3H8)?

Do problems 5 and 6 at the bottom of page 311.

Chapter 10.1 The Mole:A Measurement of Matter

C. Molar Mass

• What is Molar Mass?

It is the mass of a mole of a substance.

2. How do you determine the molar mass of an element and of a compound?

The atomic mass of an element expressed in grams on the Periodic table.

To Calculate the molar mass of a compound, do the following chart:

C. Molar Mass

Chapter 10.1 The Mole:A Measurement of Matter

Sample Problem 10.4

Finding the Molar Mass of a Compound

The decomposition of hydrogen peroxide (H2O2) provides sufficient energy to launch a rocket. What is the molar mass of hydrogen peroxide?

Do problems 7 and 8 at the bottom of page 315.

Chapter 10.1 The Mole:A Measurement of Matter

10.1 Lesson Check

Do the following problems: 12, 13, 14, 15

A. The Mole-Mass Relationships

• How do you convert the mass of a substance to the number of moles of the substance?

Use the molar mass of an element or compound to convert between the mass of a substance and the moles of the substance.

A. The Mole-Mass Relationships

Sample Problem 10.5

Converting Moles to mass

Items made out of aluminum are resistant to corrosion because of the aluminum reacts with oxygen in the air to form a coating of aluminum oxide (AL2O3). This tough, resistant coating prevents any further corrosion. What is the mass, in grams, of 9.45 mole of aluminum oxide?

Do Problems 16 and 17 at the bottom of page 318.

Sample Problem 10.6

Converting Mass to Moles

When iron is exposed to air, it corrodes to form red-brown rust. Rust is iron (III) oxide (Fe2O3). How many moles of iron (III) oxide are contained in 92.2 grams of pure Fe2O3?

Do problems 18 and 19 at the bottom of page 319.

B. The Mole-Volume Relationship

It states that equal volumes of gases at the same temperature and pressure contain equal numbers of particles.

2. What is STP?

It is standard temperature and pressure. The temperature is 0°C. Pressure is 101.3 kPa or 1 atmosphere (atm).

3. What is molar volume? 22.4 L

B. The Mole-Volume Relationship

Sample Problem 10.7

Calculating Gas Quantities at STP

Sulfur dioxide (SO2) is a gas produced by burning coal. It is an air pollutant and one of the causes of acid rain. Determine the volume, in liters, of 0.60 mole SO2 at STP.

Do problems 20 and 21 at the bottom of page 321.

Sample problem 10.8

Calculating the Molar Mass of a Gas at STP

The density of a gaseous compound containing carbon and oxygen is found to be 1.964 g/L at STP. What is the molar mass of the compound?

Do problems 22 and 23 at the bottom of page 322.

10.2 lesson Check

Do the following problems: 26, 27, 28, 29, 30, and 31.

A. % Composition of a CMPD

• What is percent composition?

It is the relative amounts of the elements in a compound.

2. How do you calculate the percent composition of a compound?

The percent by mass of an element in a compound is the number of grams of the element divided by the mass in grams of the compound, multiplied by 100%.

A. % Composition of a CMPD

Sample Problem 10.9

Calculating Percent Composition from Mass Data

When a 13.60-g sample of a compound containing only magnesium and oxygen is decomposed, 5.40 grams of oxygen is obtained. What is the percent composition of this compound?

Do problems 33 and 34 at the bottom of page 326.

Sample Problem 10.10

Calculating Percent Composition from a Formula

Propane (C3H8), the fuel commonly used in gas grills, is one of the compounds obtained from petroleum. Calculate the percent composition of propane.

Do problems 35 and 36 at the bottom of page 327.

Sample Problem 10.11

Calculating the Mass of an Element in a Compound Using Percent Composition.

Calculate the mass of carbon and the mass of hydrogen in 82.0 grams of propane (C3H8).

Do problems 37 and 38 at the bottom of page 329.

B. Empirical Formulas

• What is the empirical formula of a compound?

It gives the lowest whole-number ratio of the atoms or moles of the elements in a compound.

2. How can you calculate the empirical formula of a compound?

B. Empirical Formulas

Sample Problem 10.12

Determining the Empirical Formula of a Compound

A compound is analyzed and found to contain 25.9% nitrogen and 74.1% oxygen. What is the empirical formula of the compound?

Do problems 39 and 40 at the bottom of page 331.

C. Molecular Formulas

• What is the molecular formula of a compound?

It is a simple whole-number multiple of its empirical formula.

It can be same as its experimentally determined empirical formula.

C. Molecular Formulas

Sample problem 10.13

Finding the Molecular Formula of a Compound

Calculate the molecular formula of a compound whose molar mass is 60.0 g/mole and empirical formula is CH4N.

Do problems 41 and 42 at the bottom of page 333.

10.3 Lesson Check

Do the following problems: 46, 47, and 48.

Study Guide on Page 336

Math Tune-Up: Mole Problems on Page 337

Chapter 10 Assessment

Lesson by Lesson on pages 338-342

Test on Chapter 10 Chemical Quantities