11 29 How Many Moles Part Ii
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Transcript of 11 29 How Many Moles Part Ii
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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
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Launch 11/30
1. Calculate the molecular mass of H2 (include units!).
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Launch 11/30
2. Calculate the molecular mass of NO3 (include units!).
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Launch 11/30
3. Calculate the molecular mass of Mg(ClO2)2 .
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Announcements Quiz on Friday
The mole Conversions
Unit exam in 2 weeks
Block 5 earned the party this Friday
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How many moles? - Part II Mr. Heffner 11/30/09
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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
1 mole 2.02 grams
or
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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.
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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
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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 1 mole
Example #1: mol g
2 moles X =
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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 1 mole
Example #1: mol g
2 moles X =2 X 2.02 grams
1
= 4.04 grams
units!
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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
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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 28.01 grams
Example #2: g mol
14.00 grams X =
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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 28.01 grams
Example #2: g mol
14.00 grams X =14.00 X 1 mole
28.01
= ~.5 moles
units!
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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?
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Foldable Define the following terms:
Mole Avogadro’s number
Molecular mass Conversion factor Starting unit
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Practice Questions Practice question worksheet
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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
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Exit Slip 2. Which of the following is not a correct way to
represent the molecular mass of CH4?
a.
b.
c.
d. 16.05 g/mol
1 mole 16.05 grams
16.05 grams 1 mole
16.05 moles 1 gram
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Exit Slip 3. Which of the following shows the correct way to
calculate the number of moles in 16.00 grams of O2?
a. 16.00 moles X
b. 16.00 grams X
c. 16.00 grams X
d. 16.00 moles X
32.00 grams 1 mole 1 mole
16.00 grams 1 mole
32.00 grams
16.00 grams 1 mole
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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
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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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Homework Finish practice questions