Mole PowerPoint - Avogadro's Number, Molar Mass Calculations
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Transcript Mole PowerPoint - Avogadro's Number, Molar Mass Calculations
Dozen
Couple
Few
Baker’s Dozen
Ten
Mole- unit standing for 6.02 x 1023 particles
602,000,000,000,000,000,000,000 particles
Avogadro’s Number
Atoms and Molecules are TINY!
A drop of water contains 10 trillion water
molecules!
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 atom
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!
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
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
You have 12.04x1023 atoms of sulfur. How
many moles of sulfur do you have?
How many moles are 1.20 x 1025 atoms of
phosphorous?
How many moles of magnesium is 3.01 x 1022
atoms of magnesium?
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
NO2
C6H12O6
(NH4)3PO4
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
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
1 mole of Zinc has a
mass of 65.39 g.
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?
10.0 g Fe
8.0 g O
1.15 g Mg
15.63 g Cl
Hint: What are the
conversion factors?
1 mole of Zinc has a
mass of 65.39 g.
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
1.35 mol Fe
24.5 mol O
0.876 mol Ca
1.25 mol H
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