Presentation is loading. Please wait.

Presentation is loading. Please wait.

Unit 5: Stoichiometry Moles and Molar Mass.

Published byErik Eriksen Modified over 5 years ago

Similar presentations

Presentation on theme: "Unit 5: Stoichiometry Moles and Molar Mass."— Presentation transcript:

1 Unit 5: Stoichiometry Moles and Molar Mass

2 The Mole 1 dozen = 12 eggs 1 ream = 500 sheets of paper
1 hat trick = 3 goals 1 mole = x 1023 of something Or 602,200,000,000,000,000,000,000 Also known as “Avogadro’s number”

3 The Mole 1 mole of hydrogen = 6.022 x 1023 atoms
1 mole of carbon = x 1023 atoms 1 mole of gold = x 1023 atoms 1 mole of calcium = x 1023 atoms See the pattern?

4 Understanding Check Suppose we invented a new collection unit called a “mep”. One mep contains 8 objects. A. How many paper clips in 1.0 mep? B. How many oranges in 2.0 meps? C. How many meps contain 40 gummy bears?

5 Molar Mass 1 mole of C atoms = 12.011 g 1 mole of Mg atoms = 24.305 g
Molar mass: number of grams of one mole of an element or compound 1 mole of C atoms = g 1 mole of Mg atoms = g 1 mole of Cu atoms = g What is the molar mass of the following? 1 mole of Br atoms? 1 mole of Sn atoms?

6 Molar Mass of Compounds
We can also find the molar mass of compounds by ADDING the molar masses of each element Molar masses have units of g/mol Questions to ask yourself: 1. How many of each atom? 2. Molar mass of each element? 3. Total mass from each element? Then add them all together!

7 Molar Mass of Compounds Example #1
Find the molar mass of magnesium chloride, MgCl2 Questions to ask yourself: 1. How many of each atom? 2. Molar mass of each element? 3. Total mass from each element? Then add them all together!

8 Molar Mass of Compounds Example #2
Find the molar mass of calcium hydroxide Questions to ask yourself: 1. How many of each atom? 2. Molar mass of each element? 3. Total mass from each element? Then add them all together!

9 Molar Mass Practice

10 More Practice with Molar Mass
For each of the compounds below, determine the number of atoms for each element: 1. Cu3PO4 2. Fe2(SO2)3 3. potassium phosphide Used as a quick review on Day 2

11 More Practice with Molar Mass
For each of the compounds below, determine the molar mass of the compound: 1. MnBr2 2. Sr(NO3)2 Used as a quick review on Day 2

12 Calculations with Molar Mass
Grams Moles

13 Converting Grams to Moles
Aluminum is often used for the structure of light-weight bicycle frames. How many moles of Al are in 81.0 grams of Al? 81.0 grams Al = ? moles Al Use the box method! grams 81.0 g molar mass g/mol moles down = divide

14 Converting Grams to Moles Practice
How many moles does a 25.2 gram sample of CaCl2 contain? grams molar mass moles

15 Converting Moles to Grams
The decomposition of hydrogen peroxide (H2O2) provides sufficient energy to launch a rocket. How many grams of H2O2 are needed for rocket launch that requires 5.00 moles H2O2? 5.00 moles H2O2 = ? g H2O2 Use the box method! grams molar mass g/mol moles 5.00 moles up = multiply

16 Converting Moles to Grams Practice
Aluminum satellite dishes are resistant to corrosion because 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 of 9.45 mol of Al2O3? grams molar mass moles

Download ppt "Unit 5: Stoichiometry Moles and Molar Mass."

Similar presentations

Molar Mass and Mole Calculation Problems

Molar Mass and Mole Calculation Problems
Bell Ringer What is a Mole? What is the mass of a NaCl molecule?

Bell Ringer What is a Mole? What is the mass of a NaCl molecule?
Stoichiometry 2: grams to grams Chemistry 2012-2013 Ms. Boon 10.18 & 10.19.

Stoichiometry 2: grams to grams Chemistry Ms. Boon &
Timberlake LecturePLUS1 Chemical Reactions and Quantities The Mole Calculations Using Molar Mass.

Timberlake LecturePLUS1 Chemical Reactions and Quantities The Mole Calculations Using Molar Mass.
Chapter 8 The Mole. 1 trio= 3 singers 1 six-pack Cola=6 cans Cola drink 1 dozen donuts=12 donuts 1 gross of pencils=144 pencils Collection Terms.

Chapter 8 The Mole. 1 trio= 3 singers 1 six-pack Cola=6 cans Cola drink 1 dozen donuts=12 donuts 1 gross of pencils=144 pencils Collection Terms.
What is a Mole How many socks come in a pair? 2 How many eggs are in a dozen? 12 How many eggs come in a gross? 144 How many pencils come in a ream? 500.

What is a Mole How many socks come in a pair? 2 How many eggs are in a dozen? 12 How many eggs come in a gross? 144 How many pencils come in a ream? 500.
Chapter 5 1 5.5 The Mole 5.6 Molar Mass 5.7 Mole Relationships in Chemical Equations 5.8 Mass Calculations for Reactions.

Chapter The Mole 5.6 Molar Mass 5.7 Mole Relationships in Chemical Equations 5.8 Mass Calculations for Reactions.
1 The Mole 6.02 x 10 23 2 The Mole A counting unit Similar to a dozen, except instead of 12, it’s 602 billion trillion 602,000,000,000,000,000,000,000.

1 The Mole 6.02 x The Mole A counting unit Similar to a dozen, except instead of 12, it’s 602 billion trillion 602,000,000,000,000,000,000,000.
Matter Unit.  A unit created to describe atoms because the gram and kilogram are too large to use to define an atom.  1amu = 1.66 x 10 -24 g .00000000000000000000000166g.

Matter Unit.  A unit created to describe atoms because the gram and kilogram are too large to use to define an atom.  1amu = 1.66 x g  g.
Introduction to the Mole Background When you buy eggs you usually ask for a _______ eggs. You know that one dozen of any item is ______.

Introduction to the Mole Background When you buy eggs you usually ask for a _______ eggs. You know that one dozen of any item is ______.
Topic 4.1 The Mole and Stoichiometry. 602,000,000,000,000,000,000,000 Individual atoms and molecules are too small to see and count individually. We keep.

Topic 4.1 The Mole and Stoichiometry. 602,000,000,000,000,000,000,000 Individual atoms and molecules are too small to see and count individually. We keep.
Mole-Mass Relationship. The Mole Review What is a mole? How do scientists use the concept of the mole? Who was the first person to come up with the idea.

Mole-Mass Relationship. The Mole Review What is a mole? How do scientists use the concept of the mole? Who was the first person to come up with the idea.
Molar Mass = mass in grams of one mole –Units grams/mole For elements, molar mass = atomic mass Why aren’t all atomic masses whole numbers? –Remember that.

Molar Mass = mass in grams of one mole –Units grams/mole For elements, molar mass = atomic mass Why aren’t all atomic masses whole numbers? –Remember that.
Molar Mass Conversions

Molar Mass Conversions
Stoichiometry Sherlock Holmes, in Sir Arthur Conan Doyle’s A Study in Scarlet “In solving a problem of this sort, the grand thing is to be able to reason.

Stoichiometry Sherlock Holmes, in Sir Arthur Conan Doyle’s A Study in Scarlet “In solving a problem of this sort, the grand thing is to be able to reason.
1 The Mole 6.02 X 10 23. 2 What is “The Mole??” A counting unit (similar to a dozen) 6.02 X 10 23 (in scientific notation) = 602 billion trillion = 602,000,000,000,000,000,000,000.

1 The Mole 6.02 X What is “The Mole??” A counting unit (similar to a dozen) 6.02 X (in scientific notation) = 602 billion trillion = 602,000,000,000,000,000,000,000.
Chemical Calculations Mole to Mass, Mass to Moles.

Chemical Calculations Mole to Mass, Mass to Moles.
Section 3 Moles of Compounds Objectives: Recognize the mole relationship shown by chemical formula Calculate the molar mass of a compound Calculate the.

Section 3 Moles of Compounds Objectives: Recognize the mole relationship shown by chemical formula Calculate the molar mass of a compound Calculate the.
1 Chapter 3. 2 1 trio= 3 singers 1 six-pack Cola=6 cans Cola drink 1 dozen donuts=12 donuts 1 gross of pencils=144 pencils Collection Terms.

1 Chapter trio= 3 singers 1 six-pack Cola=6 cans Cola drink 1 dozen donuts=12 donuts 1 gross of pencils=144 pencils Collection Terms.
7.1 Notes Continued…The Mole! Key Concepts Why do chemists use the mole? How can you calculate the mass of a reactant or product in a chemical reaction?

7.1 Notes Continued…The Mole! Key Concepts Why do chemists use the mole? How can you calculate the mass of a reactant or product in a chemical reaction?

Similar presentations

Ads by Google