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# Chapter 10 notes

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mole conversions, dimensional analysis, Chapter 10 notes for chemistry B class

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• Objective:
What do you do if you are asked to convert between two units, and neither one is the mole?
When calculating chemical quantities, everything goes through the ________________________
If neither of your units is a mole, you will need a ____________-step conversion problem.
One ________________ ______________ to go from the given units to __________________, and a second conversion factor to go from moles to the ______________________ units.
You know we are talking about MASS if the units are _________________.
You know we are talking about VOLUME if the units are ________________.
You know we are talking about particles if the units are ________________, _________________, or _________________ ______________.
• ### Chapter 10 notes

1. 1. Chapter 10 Notes All About the Mole
2. 2. Objectives • Convert a quantity of a chemical between moles, mass (g), particles, and volume. • Calculate the molar mass for any compound. Hi, I’m Monty Mole. I’ll be your guide for this unit…. The evil monkey from the closet has the day off….
3. 3. Molar Mass Step 1: Find each atom on the periodic table. Step 2: Find out how much each atom weighs. (atomic mass) Step: 3 Multiply the mass by the number of atoms in the molecule. Step 4: Add them all up! Try it out! Find the molar masses of the following: NaCl, SO3, H2O, PCl3
4. 4. NaCl 58 g/mol SO3 80 g/mol H2O 18 g/mol PCl3 136 g/mol
5. 5. What is a Mole? The number that we use to equal a mole is called Avogadro’s number. This number is 6.02 X 1023 •A mole is a measurement of matter. •It is used for counting things that require large numbers. •The mole is just another unit of measure like feet or grams.
6. 6. Everything Goes Through The Mole! • To convert from one unit to another, you must use the mole as an intermediate step. •In other words…you might need a “two-step” conversion problem.
7. 7. What is a “Two-Step” Conversion Problem? • Two conversion factors – One to convert from given unit to moles – One to convert from moles to wanted unit
8. 8. Mole Road Map (4 LIFE) Volume of gas 22.4 L 1 mol (STP) (grams) rm l la o o m M 1 1 m ol r la o M m 22.4 L 1 mol Mass Mole s as 6. 0 as s 6. 0 Representative Particles (atoms, molecules, or formula units) 1 2x m 10 ol 23 23 pa pa rti 1 cle rti m c le ol s s 2x 10
9. 9. Here’s An Example Calculate the number of molecules in 60.0 g NO 2. Given: 60.0 g NO2 1st Conversion: Molar Mass Equality molar mass NO2 : 46.01 g 46.01 g = 1 mol 2nd Conversion: Definition of Mole Equality 1 mol = 6.02 x 1023 molecules
10. 10. So here’s the equation: 60.0 g NO2 x 1 mol 46.01 g NO2 x 6.02 x 1023 molecules = 1 mol 7.85 x 1023 molecules NO2
11. 11. Another Example Calculate the volume, in liters, of 3.24 x 10 22 molecules of Cl2 (STP). 3.24 x 1022 molecules Cl2 x 1 mol x 22.4 L Cl2 = 6.022 x 1023 molecules 1 mol 1.21 L Cl2
12. 12. Now let’s practice!!! HAAA AAHAHAAAA! How many moles is 2.80 X 1024 atoms of silicon? How many moles is 2.17 X 1023 particles of bromine? How many moles are in 20 grams of NaCl? Determine the volume in liters of 5 moles of hydrogen gas.
13. 13. SUM IT UP! • How many moles are in 100 grams of water?
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