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Mole Conversions, Molar Mass, Percent Composition Week 21 Chemistry

Mole Conversions, Molar Mass, Percent Composition Week 21 Chemistry

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Page 1: Mole Conversions, Molar Mass, Percent Composition Week 21 Chemistry

Mole Conversions, Molar Mass, Percent Composition

Week 21 Chemistry

Page 2: 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?

Page 3: Mole Conversions, Molar Mass, Percent Composition Week 21 Chemistry

Agenda

Warm Up: 7 Minutes Notes/Examples: 15 minutes Guided Practice: 12 minutes Independent Practice: 15 minutes Closing: 4 Minutes

Page 4: Mole Conversions, Molar Mass, Percent Composition Week 21 Chemistry

Goal For Today

One Step Mole Calculations

2.0moles x6.02 x1023molecules

1mole=1.204 x1024molecules

Page 5: Mole Conversions, Molar Mass, Percent Composition Week 21 Chemistry

Review of Types of Particles

Single Element

Covalent Compound

Ionic Compound

Atom

Molecules

Formula Unit

Page 6: Mole Conversions, Molar Mass, Percent Composition Week 21 Chemistry

Conversion Factor of the Day

1mole=6.02 x 1023Particles (atoms ,molecules ,FormulaUnits)

1𝑚𝑜𝑙𝑒6.02𝑥1023𝑃𝑎𝑟𝑡𝑖𝑐𝑙𝑒𝑠

6.02𝑥1023𝑃𝑎𝑟𝑡𝑖𝑐𝑙𝑒𝑠1𝑚𝑜𝑙𝑒

How dowe know whichone¿ use?

Page 7: Mole Conversions, Molar Mass, Percent Composition Week 21 Chemistry

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.

Page 8: Mole Conversions, Molar Mass, Percent Composition Week 21 Chemistry

Example 1

How many atoms does 12.0 moles of He represent?

Page 9: Mole Conversions, Molar Mass, Percent Composition Week 21 Chemistry

Example 2

How many moles does 1.1 x 1021 molecules of Carbon Dioxide (CO2) represent?

Page 10: Mole Conversions, Molar Mass, Percent Composition Week 21 Chemistry

Example 3

How many formula units are in 5.1 moles of Calcium Hydroxide, Ca(OH)2?

Page 11: Mole Conversions, Molar Mass, Percent Composition Week 21 Chemistry

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.

Page 12: Mole Conversions, Molar Mass, Percent Composition Week 21 Chemistry

#1

How many molecules are in 0.723 moles of Dihydrogen Monoxide, H2O?

Page 13: Mole Conversions, Molar Mass, Percent Composition Week 21 Chemistry

#2

How many moles are in 2.3 x 1025 formula units of Potassium Permanganate, KMnO4?

Page 14: Mole Conversions, Molar Mass, Percent Composition Week 21 Chemistry

#3

How many manganese atoms are in 4.2 x 10-5 moles of Mn, manganese?

Page 15: Mole Conversions, Molar Mass, Percent Composition Week 21 Chemistry

Independent Practice

Practice makes Perfect

85%

Page 16: Mole Conversions, Molar Mass, Percent Composition Week 21 Chemistry

Closing

What relationships are necessary to perform mole calculations?

Page 17: Mole Conversions, Molar Mass, Percent Composition Week 21 Chemistry

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

Page 18: Mole Conversions, Molar Mass, Percent Composition Week 21 Chemistry

Agenda

Warm Up: 7 Minutes Expectations for Stations: 4 minutes Stations Review: 40 minutes Closing: 2 Minutes

Page 19: Mole Conversions, Molar Mass, Percent Composition Week 21 Chemistry

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

Page 20: Mole Conversions, Molar Mass, Percent Composition Week 21 Chemistry

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

Page 21: Mole Conversions, Molar Mass, Percent Composition Week 21 Chemistry

Closing

Why did we review these concepts? Why is it important that everybody master

these objectives?

Page 22: Mole Conversions, Molar Mass, Percent Composition Week 21 Chemistry

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

Page 23: Mole Conversions, Molar Mass, Percent Composition Week 21 Chemistry

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

Page 24: Mole Conversions, Molar Mass, Percent Composition Week 21 Chemistry

Agenda

Seating Chart: 3 minutes Warm Up: 7 Minutes Notes/Examples: 15 minutes Guided Practice: 12 minutes Independent Practice: 12 minutes Closing: 4 Minutes

Page 25: Mole Conversions, Molar Mass, Percent Composition Week 21 Chemistry

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?

Page 26: Mole Conversions, Molar Mass, Percent Composition Week 21 Chemistry

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?

Page 27: Mole Conversions, Molar Mass, Percent Composition Week 21 Chemistry

Goal For Today

Multi Step Mole Calculations

2.0moles CO2 x6.02x 1023moleculesCO2

1moleC O2x2Oxygenatoms1moleculeC O2

=2.408 x1024 atoms

Page 28: Mole Conversions, Molar Mass, Percent Composition Week 21 Chemistry

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

Page 29: Mole Conversions, Molar Mass, Percent Composition Week 21 Chemistry

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.

Page 30: Mole Conversions, Molar Mass, Percent Composition Week 21 Chemistry

Moles

Formula Unit

(M + NM, Ionic)

Ions

Molecules

(NM + NM, Covalent)

Atoms

Atoms (single

element)

Page 31: Mole Conversions, Molar Mass, Percent Composition Week 21 Chemistry

Example 1

How many atoms does 12.0 moles of Sulfur Dioxide (SO2) represent?

Page 32: Mole Conversions, Molar Mass, Percent Composition Week 21 Chemistry

Example 2

How many hydroxide ions are in 5.1 moles of Calcium Hydroxide, Ca(OH)2?

Page 33: Mole Conversions, Molar Mass, Percent Composition Week 21 Chemistry

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.

Page 34: Mole Conversions, Molar Mass, Percent Composition Week 21 Chemistry

#1

How many ions are in 2.3 formula units of Potassium Permanganate, KMnO4?

Page 35: Mole Conversions, Molar Mass, Percent Composition Week 21 Chemistry

#2

How many oxygen atoms are in 0.723 moles of Dihydrogen Monoxide, H2O?

Page 36: Mole Conversions, Molar Mass, Percent Composition Week 21 Chemistry

#3

How many zinc ions are in 4.2 x 10-5 moles of Zinc Chloride (ZnCl2)?

Page 37: Mole Conversions, Molar Mass, Percent Composition Week 21 Chemistry

Independent Practice

Practice makes Perfect

85%

Page 38: Mole Conversions, Molar Mass, Percent Composition Week 21 Chemistry

Closing

What relationships are necessary to perform mole calculations?

Page 39: Mole Conversions, Molar Mass, Percent Composition Week 21 Chemistry

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

Page 40: Mole Conversions, Molar Mass, Percent Composition Week 21 Chemistry

Agenda

Warm Up: 7 Minutes Notes/Examples: 13 minutes Guided Practice: 10 minutes Independent Practice: 13 minutes Closing: 2 Minutes

Page 41: Mole Conversions, Molar Mass, Percent Composition Week 21 Chemistry

What is Molar Mass?

The mass (in grams) of one mole of the substance

Page 42: Mole Conversions, Molar Mass, Percent Composition Week 21 Chemistry

Units for Molar Mass

g/mol

Read as “grams per mole”

Page 43: Mole Conversions, Molar Mass, Percent Composition Week 21 Chemistry

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)

Page 44: Mole Conversions, Molar Mass, Percent Composition Week 21 Chemistry

Example 1:

Calculate the Molar Mass of NaBr

Page 45: Mole Conversions, Molar Mass, Percent Composition Week 21 Chemistry

Example 2:

Calculate the Molar Mass of C6H12O6.

Page 46: Mole Conversions, Molar Mass, Percent Composition Week 21 Chemistry

Example 3:

Calculate the Molar Mass of

Al2(SO4)3

Page 47: Mole Conversions, Molar Mass, Percent Composition Week 21 Chemistry

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.

Page 48: Mole Conversions, Molar Mass, Percent Composition Week 21 Chemistry

Guided Practice #1

Calculate the Molar Mass of AgF2

145.864 g/ mol

Page 49: Mole Conversions, Molar Mass, Percent Composition Week 21 Chemistry

Guided Practice #2

Calculate the Molar Mass of Calcium Nitrate.

Ca(NO3)2

164.086 g/ mol

Page 50: Mole Conversions, Molar Mass, Percent Composition Week 21 Chemistry

Guided Practice #3

Calculate the Molar Mass of Tetracarbon Trioxide.

C4O3

96.041 g/mol

Page 51: Mole Conversions, Molar Mass, Percent Composition Week 21 Chemistry

Independent Practice

Practice makes Perfect

85%

Page 52: Mole Conversions, Molar Mass, Percent Composition Week 21 Chemistry

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

Page 53: Mole Conversions, Molar Mass, Percent Composition Week 21 Chemistry

Closing

In terms of a percentage, does the molar mass represent the part or the whole?