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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?