1. Grab…handouts on doorbinders

2. Begin the Do Now Track Your Progress on

QUIZ LTshandout (15 min)

The Mole and Molar Mass!

What do the following all have in common?

What doesn’t belong?

DozenCoupleFewBaker’s DozenTen

Key Point #1: The Mole

Mole- counting unit standing for 6.02 x 1023 particles

Tells us how many particles of a compound are actually involved in a reaction

1 mole = 6.02 x 1023 particles

602,000,000,000,000,000,000,000 particles

Avogadro’s Number

Mole Samples

1 mole of water = how many particles?

1 mole of sugar = how many particles

6.02 x 1023 particles = how many moles?

Very Similar to a Dozen!

A dozen eggs would make a HUGE omelet!

A mole of eggs would make an omelet big enough to cover the Earth thirty times!

Why such a BIG unit?

Atoms and Molecules are TINY!

A drop of water contains 10 trillion water particles!

Moles and Particles

6.02 x 1023 makes a chemist’s life a lot easier

It’s impossible to keep track of one atom so scientist discovered this number that

gives us the molar mass of an atomMolar mass is the mass of 6.02 x

1023 particles of a given substance Mass is given in grams

Honors

We don’t always have exactly 1 mole, though.

When we have different amounts of moles, we can convert between atoms and moles

Mole Calculations

Moles Particles

Multiply by Avogadro’s Number

Divide by Avogadro’s Number

Example 1

A lab experiment calls for 2.00 moles of Calcium. How many particles of Calcium are required?

How can we solve this? Dimensional Analysis!▪ ID what we’re given and what the question’s

asking for and set up the T-Chart

2 moles Calcium

1 mole Calcium

6.02 x 1023 particles

Example 2

You have 12.04x1023 atoms of sulfur. How many moles of sulfur do you have?

Molar Mass

Key Point #2: Molar Mass

Molar Mass = the mass of 1 mole of a substance

Tells us what mass of a substance is used in a reaction

Molar mass: mass of 1 mole of in grams

1 mole C atoms = ___________ particles

1 mole of C atoms has a molar mass of_________ g.

Molar mass of O = ___________

Molar mass of Li = ____________

For any element, the

Molar Mass = Mass Number

3.2

What is the mass of one mole of:

C S

Cu Fe

Hg

3.2

Steps to Calculate Molar Mass of Compounds:

1) Count out the atoms in the compound

2) Look up the Molar Mass for each element

3) Multiply the Molar Mass of each element by the # present in the compound

4) Sum the Molar Masses

Stations!

No more than 4 at a station

10 min at each station max

If completed before 10 min is up, check answers up at the front

Use your station buddies for help before asking Ms. Herndon!

Calculate the molar mass of the following

NO2

SO2

(NH4)3PO4

C6H12O6

EXIT TICKET # 8

1) How many particles are in a mole?2) Determine the Molar Mass for the

following problems. Don’t forget your UNITS!

a. Helium (He)

b. KCl4

c. Cu(OH)2

When I bought my fly kicks…

If I had 20 Dollars, and the cost of one pair of kicks is 4 dollars for 1 pair, how many pairs could I have?

20 Dollars

4 Dollars

1 pair (20/4) pairs 5 pairs

Now...

What’s my conversion factor?

What unit am I given?

What unit is the question asking for?

Grams Moles

If I had 20 grams of helium, and one mole of helium is 4 grams, how many moles of helium could I have?

20 grams He

4 grams He

1 mole He (20/4) moles He 5 moles He

What’s my conversion factor?

What unit am I given?

What unit is the question asking for?