chapter 7.1: the mole and molar conversions
DESCRIPTION
Chapter 7.1: The Mole and Molar Conversions. Objectives: (1) To define the mole. (2) To perform molar conversions. THE MOLE. Do you know the following?. 1 pair = 1 dozen = 1 score = 1 gross = 1 ream = 1 mole (mol) =. 1 pair = 2 1 dozen = 12 1 score = 20 1 gross = 144 - PowerPoint PPT PresentationTRANSCRIPT
Chapter 7.1: The Mole and Molar Conversions
Objectives: (1) To define the mole. (2) To perform molar conversions.
Do you know the following?
1 pair = 1 dozen = 1 score = 1 gross = 1 ream = 1 mole (mol) =
1 pair = 2 1 dozen = 12 1 score = 20 1 gross = 144 1 ream = 500 1 mole (mol) = 6.02 x 1023
The MOLE
A mole of a substance is 6.02x1023 representative particles of that substance.
This number is called Avogadro’s number.
The symbol for mole is mol.
Representative Particle
The term representative particle refers to the species present in a substance (i.e. atoms or molecules) Example: Ca is one atom Example: CO2 is one molecule (i.e.
molecular compound)
Representative Particle
What is the representative particle of Ca?
What is the representative particle of H2O?
What is the representative particle of CO?
What is the representative particle of Zn?
Representative Particle What is the representative particle of Ca?
atom
What is the representative particle of H2O? molecule
What is the representative particle of CO? molecule
What is the representative particle of Zn?
atom
The Concept of the Mole
One mole of donuts contains 6.02 x 1023 donuts One mole of H2O contains 6.02 x 1023
molecules One mole of nails contains 6.02 x 1023 nails One mole of Fe contains 6.02 x 1023 atoms One mole of dogs contains 6.02 x 1023 dogs One mole of electrons contains 6.02 x 1023
electrons
Get the idea?
Just How Big is a Mole?
Mole Facts
6.02 X 1023 Watermelon Seeds: Would be found inside a melon slightly larger than the moon.
6.02 X 1023 Donut Holes: Would cover the earth and be 5 miles (8 km) deep.
6.02 X 1023 Pennies: Would make at least 7 stacks that would reach the moon.
6.02 X 1023 Grains of Sand: Would be more than all of the sand on Miami Beach.
Molar Conversions
How many eggs are in 15 dozen?
Molar Conversions
How many eggs are in 15 dozen?
15 dozen 12 eggs
1 dozen180 eggs
Molar Conversions Roadmap
Atoms or Molecules
MOLES Grams
Divide by 6.022x1023
Multiply by 6.022x1023
Multiply by molar mass
Divide by molar mass
Solving Molar Conversion Problems
Step 1: Figure out how many parts your calculation will have using the diagram.
Step 2: Make a T-chart and enter number/units in the appropriate spaces.
Step 3: Fill in your conversion factor. Step 4: Cancel units. Step 5: Multiply numbers on top and
divide by numbers on the bottom.
Example #1
How many moles are in 3.01 x 1023 molecules of sulfur dioxide?
Example #1
How many moles are in 3.01 x 1023
molecules of sulfur dioxide?
3.01 x 1023
molecules SO2
6.02 x 1023
molecules SO2
1 mol SO2
Example #1
How many moles are in 3.01 x 1023
molecules of sulfur dioxide?
3.01 x 1023
molecules SO2
6.02 x 1023
molecules SO2
1 mol SO2
0.50 mol SO2
Example #2
How many moles of carbon dioxide are present in 3.161 x 1023 molecules of carbon dioxide?
Example #2 How many moles of carbon dioxide are
present in 3.161 x 1023 molecules of carbon dioxide?
3.161 x 1023
molecules CO2
6.02 x 1023
molecules CO2
1 mol CO2
Example #2 How many moles of carbon dioxide are
present in 3.161 x 1023 molecules of carbon dioxide?
3.161 x 1023
molecules CO2
6.02 x 1023
molecules CO2
1 mol CO2
0.53 mol CO2
Example #3
How many moles of carbon are in 2.44 x 1023 atoms of carbon?
Example #3
How many moles of carbon are in 2.44 x 1023 atoms of carbon?
2.44 x 1023
atoms C
6.02 x 1023
atoms C
1 mol C
Example #3
How many moles of carbon are in 2.44 x 1023 atoms of carbon?
2.44 x 1023
atoms C
6.02 x 1023
atoms C
1 mol C
0.41 mol C
Example #4
How many molecules are in 0.125 moles of carbon dioxide?
Example #4
How many molecules are in 0.125 moles of carbon dioxide?
0.125 moles CO2
1 mole CO2
6.02 x 1023
molecules CO2
Example #4
How many molecules are in 0.125 moles of carbon dioxide?
0.125 moles CO2
1 mole CO2
6.02 x 1023
molecules CO2
7.53 x 1022 molecules CO2
Example #5
How many atoms are in 2.50 moles of Au?
Example #5
How many atoms are in 2.50 moles of Au?
2.50
moles Au
1 mole Au
6.02 x 1023
atoms Au
Example #5
How many atoms are in 2.50 moles of Au?
2.50
moles Au
1 mole Au
6.02 x 1023
atoms Au
1.51 x 1024
atoms Au