1.
Launch: 12/1
Grab your binder and immediately take a seat!
Place homework (practice questions), binder paper, and
a pen/pencil on your desk.
Today’s Objective: I can convert between moles and
atoms using Avogadro’s number as a conversion
factor
Tonight’s HW: Finish the back of the practice
question worksheet
2.
Launch 12/1
4. How many grams of NH3 are there in 2 moles of NH3?
a. 1.00 moles
b. 14.01 grams
c. 17.04 grams
d. 34.08 grams
3.
Launch 12/1
5. How many moles of N2 are there in 14.01g of N2?
a. .5 moles
b. 2 mole
c. 14.01 moles
d. 28.02 moles
4.
Announcements
Quiz on Friday
The mole
Conversions
Unit exam in 2 weeks
6.
Review: How many moles?
Molar mass
used to convert between grams and moles
units = grams/mole
can be shown as a fraction
Molar mass of H2 = 2.02 g/mol
2.02 grams 1 mole
or
1 mole 2.02 grams
7.
How many atoms?
Avogadro’s number… ..or particles, or molecules
is equal to 6.02 X 1023 atoms/mol
can be used to convert between moles and atoms
6.02 X 1023 atoms 1 mole
or
1 mole 6.02 X 1023 atoms
..or particles, or molecules
8.
How many atoms?
There is a 3-step process for conversions:
1. Write down the starting unit.
2. Write the conversion factor with the starting units on
the bottom.
3. Cancel like terms and multiply across the top and
bottom.
9.
Example #1
How many atoms are there in 2 moles of carbon (C)?
Step #1: Write down the starting unit.
2 moles
10.
Example #1
How many atoms are there in 2 moles of carbon (C)?
Step #2: Write conversion factor with the starting units on the
bottom.
6.02 X 1023 atoms
2 moles X =
1 mole
11.
Example #1
How many atoms are there in 2 moles of carbon (C)?
Step #3: Cancel like terms and multiply across the top and
bottom.
Ignore
6.02 X 1023 atoms 2 X 6.02 X 1023 atoms
2 moles X =
1 mole 1 +1
= 12.04 X 1023 atoms
= 1.204 X 1024 atoms
12.
Example #2
How many atoms are there in 1.5 moles of CO2?
Step #1: Write down the starting unit.
1.5 moles
13.
Example #2
How many atoms are there in 1.5 moles of CO2?
Step #2: Write conversion factor with the starting units on the
bottom.
6.02 X 1023 atoms
1.5 moles X =
1 mole
14.
Example #2
How many atoms are there in 1.5 moles of CO2?
Step #3: Cancel like terms and multiply across the top and
bottom.
Ignore
6.02 X 1023 atoms 1.5 X 6.02 X 1023 atoms
1.5 moles X =
1 mole 1
= 9.03 X 1023 atoms
15.
Example #3
How many moles are there in 3.01 X 1023 molecules of CO2?
Step #1: Write down the starting unit.
3.01X1023 molecules
16.
Example #3
How many molecules are there in 1.5 moles of CO2?
Step #2: Write conversion factor with the starting units on the
bottom.
1 mol
3.01X1023 molecules X =
6.02X1023 molecules
17.
Example #3
How many molecules are there in 1.5 moles of CO2?
Step #3: Cancel like terms and multiply across the top and
bottom.
1 mol 3.01 X 1 mol
3.01X1023 molecules X =
6.02X10 23 molecules 6.02
= .5 mol
18.
Whiteboards
Work in pairs
Trade-off marker every question
You have 60 seconds to solve the question
Show all of your work!
Don’t forget units!
Lift board only when prompted
19.
How many atoms are there
in 1 mole of potassium (K)?
20.
How many molecules are
there in .5 moles of HCl?
21.
How many moles of NO are
there in 9.03 X 1023 particles?
22.
How many moles of
fluorine (F) are there in
12.04 X 1023 atoms?
23.
Practice Questions
Practice question worksheet
24.
Exit Slip
1. What is Avogadro’s number?
a. 6.02 X 1024 atoms
b. 6.02 X 1023 atoms
c. 3.01 X 1023 atoms
d. 1.2 X 1024 atoms
25.
Exit Slip
2. Which of the following shows the correct way to
calculate the number of atoms in 2 moles of O2?
32.00 grams
a. 16 moles X
1 mole
1 mole
b. 2 moles X 16.00 grams
1 atoms
c. 2 moles X 6.02 X 1023 moles
6.02 X 1023 atoms
d. 2 moles X
1 mole
26.
Exit Slip
3. How many atoms of sodium (Na) are in 1 mole?
a. 3.01 X 1023 atoms
b. 6.02 X 1023 atoms
c. 12.04 X 1023 atoms
d. 1.204 X 1024 atoms
27.
Exit Slip
4. How many molecules of C3OH are in .5 moles?
a. 3.01 X 1023 molecules
b. 6.02 X 1023 molecules
c. 9.03 X 1023 molecules
d. 1.204 X 1024 atoms
28.
Exit Slip
5. If there are 1.204 X 1024 particles of gold (Au), how
many moles are there?
a. .5 moles
b. 1 mole
c. 2 moles
d. 4 moles
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