Mole Conversions, Molar Mass, Percent Composition Week 21 Chemistry.
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Transcript of Mole Conversions, Molar Mass, Percent Composition Week 21 Chemistry.
Mole Conversions, Molar Mass, Percent Composition
Week 21 Chemistry
Warm Up: 4 Minutes
How many molecules are in 2.0 moles of Carbon Dioxide?
Write the Learning Target
You should be working SILENTLY
Stay in your own seat
Hint: 1 mole = _______ particles?
Agenda
Warm Up: 7 Minutes Notes/Examples: 15 minutes Guided Practice: 12 minutes Independent Practice: 15 minutes Closing: 4 Minutes
Goal For Today
One Step Mole Calculations
2.0moles x6.02 x1023molecules
1mole=1.204 x1024molecules
Review of Types of Particles
Single Element
Covalent Compound
Ionic Compound
Atom
Molecules
Formula Unit
Conversion Factor of the Day
1mole=6.02 x 1023Particles (atoms ,molecules ,FormulaUnits)
1𝑚𝑜𝑙𝑒6.02𝑥1023𝑃𝑎𝑟𝑡𝑖𝑐𝑙𝑒𝑠
6.02𝑥1023𝑃𝑎𝑟𝑡𝑖𝑐𝑙𝑒𝑠1𝑚𝑜𝑙𝑒
How dowe know whichone¿ use?
Requirements of Mole Calculations
Identify the given quantity, unit, and element (or compound).
Identify the unknown quantity, unit, and element (or compound).
Identify the relationship(s) between the given unit and the unknown unit.
Example 1
How many atoms does 12.0 moles of He represent?
Example 2
How many moles does 1.1 x 1021 molecules of Carbon Dioxide (CO2) represent?
Example 3
How many formula units are in 5.1 moles of Calcium Hydroxide, Ca(OH)2?
Guided Practice Expectations
As Mr. Ghosh projects the question, silently read the question. (17 seconds)
When Mr. Ghosh calls Team, discuss with your teammates to solve the question correctly. (81 seconds)
Be ready to share your response when Mr. Ghosh calls SWAG.
#1
How many molecules are in 0.723 moles of Dihydrogen Monoxide, H2O?
#2
How many moles are in 2.3 x 1025 formula units of Potassium Permanganate, KMnO4?
#3
How many manganese atoms are in 4.2 x 10-5 moles of Mn, manganese?
Independent Practice
Practice makes Perfect
85%
Closing
What relationships are necessary to perform mole calculations?
Warm Up: 4 Minutes
How many moles are in 6.42 x 1028 atoms of gold?
Write the Learning Target
You should be working SILENTLY
Stay in your own seat
No more than 4 people per row
Agenda
Warm Up: 7 Minutes Expectations for Stations: 4 minutes Stations Review: 40 minutes Closing: 2 Minutes
How Will Stations Work??
You will be placed with a group of other scholars to complete four stations on the following topics:
Station 1: Mole Calculations
Station 2: Writing Formulas
Station 3: Writing Names of Compounds
Station 4: Quantifying Atoms and Ions in Molecules and Formula Units
You Need: •Periodic Table•Notes
How Will Stations Work??
You will spend 10 minutes at each station working each problem as a group on scratch paper.
You will write your FINAL answer on the answer document.
When time is called, you will leave your current station and move on to the next station
You will have 10 seconds to move to the next station
Closing
Why did we review these concepts? Why is it important that everybody master
these objectives?
About your seats
Seats were chosen to help you focus and succeed in class Grades and behavior were factors
You must sit in your assigned seat every day If not, I will mark you absent
You may NEVER move the seats around. Seats are arranged to make sure everyone can see the board
Warm Up: 4 Minutes
How many molecules are in 2.0 moles of Carbon Dioxide (CO2)?
How many oxygen atoms are in one molecule of Carbon Dioxide (CO2)?
Write the Learning Target
You should be working SILENTLY
Stay in your own seat
Agenda
Seating Chart: 3 minutes Warm Up: 7 Minutes Notes/Examples: 15 minutes Guided Practice: 12 minutes Independent Practice: 12 minutes Closing: 4 Minutes
The Warm-up…
So what if I asked you how many oxygen atoms were in 2 moles of Carbon Dioxide (CO2)?
How would you do it?
Question…
What is 2 x 3?
What is 6 x 4?
What is 2 x 3 x 4?
6
24
24
How did we do this?
Goal For Today
Multi Step Mole Calculations
2.0moles CO2 x6.02x 1023moleculesCO2
1moleC O2x2Oxygenatoms1moleculeC O2
=2.408 x1024 atoms
Relationships between particles
Covalent Compounds (Molecules) are made of atoms
Ionic Compounds (Formula Units) are made of ions
Example: CO2 3 atoms
Example: NO 2 atoms
Example: BaCl2 3 ions
Example: ZnSO4 2 ionsPolyatomic Ion
Reminder: Requirements of Mole Calculations
Identify the given quantity, unit, and element (or compound).
Identify the unknown quantity, unit, and element (or compound).
Identify the relationship(s) between the given unit and the unknown unit.
Moles
Formula Unit
(M + NM, Ionic)
Ions
Molecules
(NM + NM, Covalent)
Atoms
Atoms (single
element)
Example 1
How many atoms does 12.0 moles of Sulfur Dioxide (SO2) represent?
Example 2
How many hydroxide ions are in 5.1 moles of Calcium Hydroxide, Ca(OH)2?
Guided Practice Expectations
As Mr. Ghosh projects the question, silently read the question. (17 seconds)
When Mr. Ghosh calls Team, discuss with your teammates to solve the question correctly. (81 seconds)
Be ready to share your response when Mr. Ghosh calls SWAG.
#1
How many ions are in 2.3 formula units of Potassium Permanganate, KMnO4?
#2
How many oxygen atoms are in 0.723 moles of Dihydrogen Monoxide, H2O?
#3
How many zinc ions are in 4.2 x 10-5 moles of Zinc Chloride (ZnCl2)?
Independent Practice
Practice makes Perfect
85%
Closing
What relationships are necessary to perform mole calculations?
Warm Up: 4 MinutesWrite the Learning
Target
You should be working SILENTLY
Stay in your own seat
Compound How many Aluminum atoms?
How many Sulfur atoms?
How many Oxygen atoms?
Al2(SO4)3Name Chemical Formula
Barium Nitrate
Triphosphorus Hexafluoride
Sodium Hydroxide
Agenda
Warm Up: 7 Minutes Notes/Examples: 13 minutes Guided Practice: 10 minutes Independent Practice: 13 minutes Closing: 2 Minutes
What is Molar Mass?
The mass (in grams) of one mole of the substance
Units for Molar Mass
g/mol
Read as “grams per mole”
How to find the Molar Mass of a Compound?
For the compound XaYbZc
Use this formula
Molar Mass = a(Atomic Mass X ) + b( Atomic Mass Y ) + c(Atomic Mass Z)
Example 1:
Calculate the Molar Mass of NaBr
Example 2:
Calculate the Molar Mass of C6H12O6.
Example 3:
Calculate the Molar Mass of
Al2(SO4)3
Expectations for Guided Practice
Take the first 13 seconds to write the chemical formula or name.
With your shoulder partner, take 61 seconds to find the molar mass.
When Mr. Ghosh calls SWAG, be ready to share your answers out loud.
Guided Practice #1
Calculate the Molar Mass of AgF2
145.864 g/ mol
Guided Practice #2
Calculate the Molar Mass of Calcium Nitrate.
Ca(NO3)2
164.086 g/ mol
Guided Practice #3
Calculate the Molar Mass of Tetracarbon Trioxide.
C4O3
96.041 g/mol
Independent Practice
Practice makes Perfect
85%
Answer Key
1. 70.906 g/ mol
2. 56.105 g/ mol
3. 79.918 g/ mol
4. 162.206 g/ mol
5. 67.804 g/ mol
6. 120.913 g/ mol
7. 58.319 g/ mol
8. 240.892 g/mol
9. 64.064 g/ mol
10. 97.994 g/ mol
11. 132.14 g/ mol
12. 60.052 g/ mol
13. 331.208 g/ mol
14. 379.629 g/ mol
Closing
In terms of a percentage, does the molar mass represent the part or the whole?