Transcript Mole PowerPoint - Avogadro's Number, Molar Mass Calculations

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Dozen
Couple
Few
Baker’s Dozen
Ten
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Mole- unit standing for 6.02 x 1023 particles
602,000,000,000,000,000,000,000 particles
Avogadro’s Number
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Atoms and Molecules are TINY!
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A drop of water contains 10 trillion water
molecules!
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6.02 x 1023 makes a chemist’s life a lot easier
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It’s impossible to keep track of one atom
 so scientist discovered this number that gives us
the molar mass of an atom
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Molar mass is the mass of 6.02 x 1023
particles of a given substance
 Mass is given in grams
Luckily 6.02 x 1023 particles, or a mole, adds up to
the same number as the avg. atomic mass-but in
grams
 So a mole of magnesium has a mass of 24.305
grams!
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We don’t always have exactly 1 mole, though.
When we have different amounts of moles, we can
convert between atoms and moles
Multiply by Avogadro’s Number
Moles
Particles
Divide by Avogadro’s Number
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A lab experiment calls for 2.00 moles of
Calcium. How many particles of Calcium are
required?
How can we solve this?
▪ ID what we’re given and what the question’s asking for
and set up the T-Chart
23
2 moles Calcium 6.02 x 10 particles
1 mole Calcium
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You have 12.04x1023 atoms of sulfur. How
many moles of sulfur do you have?
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How many moles are 1.20 x 1025 atoms of
phosphorous?
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How many moles of magnesium is 3.01 x 1022
atoms of magnesium?
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How many atoms are in 0.750 moles of zinc?
Converting from grams  mole
Mole  grams
Calculating molecular mass
Molar mass: mass of 1 mole of
in grams
1 mole C atoms = _____________________
1 mole of C atoms has a mass of_________ g.
Molar mass of O = ___________
Molar mass of Li = ____________
For any element, the
__________________________________
__________________________________
3.2
What is the mass of one mole of:
S
C
Hg
Cu
Fe
3.2
Molecular mass (or molar mass) is the sum of
the molar masses of all the atoms in a molecule.
S
O
SO2
SO2
32.06 g/mol
16.00 g/mol
64.06 g/mol
SO2 consists of ________
and ______________.
1 mole SO2 = _________________
________________molecules of SO2
has a total mass of ______________
3.3
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NO2
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C6H12O6
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(NH4)3PO4
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If I had 20 Wolfies, and the cost of one pair of
kicks is 4 Wolfies for 1 pair, how many pairs
could I have?
What’s my conversion factor?
What unit am I given?
What unit is the question asking for?
20 Wolfie
1 pair
4 Wolfies
Now...
(20/4) pairs
5 pairs
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If I had 20 grams of helium, and one mole of
helium is 4 grams, how many moles of helium
could I have?
What’s my conversion factor?
What unit am I given?
What unit is the question asking for?
20 grams He 1 mole He
4 grams He
(20/4) moles He
5 moles He
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1 mole of Zinc has a
mass of 65.39 g.
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Conversion factor:
1 mole Zn
65.39 g Zn OR
65.39 g Zn
1 mole Zn
How many moles of Zn
are in 85 grams?
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10.0 g Fe
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8.0 g O
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1.15 g Mg
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15.63 g Cl
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Hint: What are the
conversion factors?
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1 mole of Zinc has a
mass of 65.39 g.
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Conversion factor:
1 mole Zn
65.39 g Zn OR
65.39 g Zn
1 mole Zn
If I had 2 moles of Zn,
how many grams of
Zn do I have?
2 moles Zn
65.39 g Zn
1 mole Zn
130.78 g Zn
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1.35 mol Fe
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24.5 mol O
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0.876 mol Ca
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1.25 mol H
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Hint: What are the
conversion factors?
2.3 moles C3H8
44 g C3H8
2.3 x 44 g C3H8
101.2 g C3H8
1 mole C3H8
2.3 moles C3H8 6.02 x 1023 molecules C3H8
1 mole C3H8
2.3 x (6.02 x 1023 molecules C3H8)
13.2 x 1023 molecules C3H8