1.
Launch: 11/30
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 grams and
moles using molecular mass as a conversion
factor
Tonight’s HW: Finish practice question worksheet
2.
Launch 11/30
1. Calculate the molecular mass of H2 (include units!).
3.
Launch 11/30
2. Calculate the molecular mass of NO3 (include units!).
4.
Launch 11/30
3. Calculate the molecular mass of Mg(ClO2)2 .
5.
Announcements
Quiz on Friday
The mole
Conversions
Unit exam in 2 weeks
Block 5 earned the party this Friday
7.
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
8.
How many moles?
There is a 3-step process:
1. Write down the starting unit.
2. Calculate molecular mass and turn it into a
conversion factor with the starting units on the
bottom.
3. Cancel units and multiply across the top and
bottom.
9.
Example #1: mol g
How many grams of H2 are there in 2 moles of H2?
Step #1: Write down the starting unit.
2 moles
10.
Example #1: mol g
How many grams of H2 are there in 2 moles of H2?
Step #2: Calculate molecular mass and turn it into a conversion
factor with the starting units on the bottom.
2.02 grams
2 moles X =
1 mole
11.
Example #1: mol g
How many grams of H2 are there in 2 moles of H2?
Step #3: Cancel units and multiply across the top and bottom.
2.02 grams 2 X 2.02 grams
2 moles X =
1 mole 1
= 4.04 grams
units!
12.
Example #2: g mol
How many moles of CO are there in 14.00 grams of CO?
Step #1: Write down the starting unit.
14.00 grams
13.
Example #2: g mol
How many moles of CO are there in 14.00 grams of CO?
Step #2: Calculate molecular mass and turn it into a conversion
factor with the starting units on the bottom.
1 mole
14.00 grams X =
28.01 grams
14.
Example #2: g mol
How many moles of CO are there in 14.00 grams of CO?
Step #3: Cancel units and multiply across the top and bottom.
1 mole 14.00 X 1 mole
14.00 grams X =
28.01 grams 28.01
= ~.5 moles
units!
15.
Partner Teaching
Partner A teaches Partner B
Partner A writes and narrates
Partner B listens
Partner B completes the problem on own paper
Switch!
1. How many moles of O2 are there in 64.00 grams of
O2?
2. How many grams of NO2 are there in 4 moles of
NO2?
16.
Foldable
Define the following terms:
Mole
Avogadro’s number
Molecular mass
Conversion factor
Starting unit
17.
Practice Questions
Practice question worksheet
18.
Exit Slip
1. What is the molar mass of Al(OH)3?
a. 43.99 g/mol
b. 78.01 g/mol
c. 300.03 g/mol
d. 303.00 g/mol
19.
Exit Slip
2. Which of the following is not a correct way to
represent the molecular mass of CH4?
16.05 moles
a. 1 gram
16.05 grams
b.
1 mole
c. 1 mole
16.05 grams
d. 16.05 g/mol
20.
Exit Slip
3. Which of the following shows the correct way to
calculate the number of moles in 16.00 grams of O2?
32.00 grams
a. 16.00 moles X
1 mole
1 mole
b. 16.00 grams X 16.00 grams
1 mole
c. 16.00 grams X 32.00 grams
16.00 grams
d. 16.00 moles X
1 mole
21.
Exit Slip
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
22.
Exit Slip
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
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