kittens21 couple of meatballs121 dozen pencils1441 gross of

How many is that?

kittens21 Couple of

How many is that?

meatballs

121 dozen

How many is that?

pencils1441 gross of

How many is that?

stars

1 mole of602,200,000,000,000,000,000,000

1 mole =

602,200,000,000,000,000,000,000

The Mole ?

The Mole ?

The Mole ?

The Mole !

602,200,000,000,000,000,000,0006.022 x 10 x 10 x 10 x 10 x 10 x 10 x 10 x 10 x 10 x 10 x 10 x 10 x 10 x 10 x 10 x 10 x 10 x 10 x 10 x 10 x 10 x 10 x 10

6.022 x 1023

Avogadro’s Number6.022 x 1023 = “Avogadro’s Number”.

Amadeo Avogadro(1776-1855)

I didn’t discover it. It’s just named after

me!

What’s the mass of … 1 dozen kittens? (1 kitten weighs 3 lbs)

1 dozen 12 kittens 3 lbs

1 dozen 1 kitten36 lbs

What’s the mass of … 6 dozen meatballs? (1 meatball weighs

35 grams)

6 dozen 12 meatballs35 grams1 dozen 1 meatball

2520 grams

What’s the mass of …

3 gross pencils? (1 pencil weighs 15 grams)

3 gross 144 pencils 15 grams1 gross 1 pencil

6480 grams

What’s the mass of a mole???

Depends...

If it’s a mole of kittens, we take the mass of one kitten… and multiply by how many kittens.

3 lbs x 6.022 x 1023

If it’s a mole of Carbon atoms, it’s easier than that!

Carbon’s atomic mass = 12.0 grams/mole

SUPER IMPORTANT CONCEPT!

Molar Mass = the mass (in grams) of 1 mole (6.022 x 1023) of anything

Finding the molar mass of an element is pretty easy!• Take it’s atomic mass and make the units

“X grams/1 mole of X atoms”

Try it: Molar mass of Lithium? Helium?

Iron?

6.94 grams/1 mole Li atoms4.00 grams/1 mole He atoms55.85 grams/1 mole Fe atoms

Calculations with Moles:Converting moles to grams

How many grams of lithium are in 3.50 moles of lithium?

3.50 mol Li = g Li1 mol Li

6.94 g Li 24.29

Calculations with Moles:Converting grams to moles

How many moles of lithium are in 18.2 grams of lithium?

18.2 g Li= mol Li

6.94 g Li

1 mol Li 2.62

Calculations with Moles:Using Avogadro’s Number

How many atoms of lithium are in 3.50 moles of lithium?

3.50 mol

= atoms1 mol

6.02 x 1023 atoms 2.11 x 1024

Calculations with Moles:Using Avogadro’s Number

How many atoms of lithium are in 18.2 g of lithium?

18.2 g Li

= atoms Li

1 mol Li 6.022 x 1023 atoms Li

1.58 x 1024

6.94 g Li 1 mol Li

(18.2)(6.022 x 1023)/6.94

You try it!

If you had 107.92 grams of Aluminum foil, how many moles of Aluminum are there?

= moles Al atoms

You try it!

If you had 3.011 x 1023 atoms of Calcium, how many grams of Calcium are there?

= grams Ca

What about for compounds, you ask???

Since a compound is more than one atom bonded, just add the masses of all the atoms there

12.01 g + 2(16.00 g) =44.01 g

One mole of CO2 (6.02 x 1023 molecules) has a mass of 44.01 grams

Example: Carbon Dioxide (CO2)

You try it!

1 mole of NaCl would weigh exactly how many grams?

= grams NaCl

6 moles of NaCl would weigh exactly how many grams?

= grams NaCl

You try it!

How many grams of Dihydrogen Monoxide are in 6.022 x 1023 molecules of Dihydrogen Monoxide?

= grams H2O

Standard Molar Volume

Equal volumes of all gases at the same temperature and pressure contain the same number of molecules.

- Amedeo Avogadro

At STP (Standard Temperature and Pressure):Standard Temperature = 0˚ C

Standard Pressure = 1 atmosphere

1 mole of a gas occupies 22.4 liters of volume

Calculations with Moles:Using Standard Molar Volume

How many moles of hydrogen are in 100 L of hydrogen at STP?

100 L = mol

22.4 L

1 mol4.46

Calculations with Moles:Using Standard Molar Volume

How many liters are occupied by 3 moles of oxygen gas at STP?

3 mol = L

1 mol

22.4 L67.2

You try it!

16 moles of Cl2 gas would occupy how many liters?

= L Cl2

= grams Cl2

16 moles of Cl2 gas would have a mass of how many grams?

Do it all at once!

35 grams of carbon tetrafluoride gas would occupy how many liters?

1 mol CF4 = L CF4

1 mol

22.4 L

8.988.01 g

35 g

You try it!

1373 grams of N2 gas would occupy how many liters?

…………………………………………………..= L N2

Mole Relationship

s

Mole

Atomsor

molecules

Liters

Grams

6.02 x 10 23

Ato

mic

Mass

22. 4

L22.4 L