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Section 10.2 lecture (part A) for Honors & Prep Chemistry
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Bellwork- An argument for recycling
An aluminum can contains 0.5 moles of aluminum metal.
1.How many particles are in the aluminum can?
2.How much does one mole of aluminum weigh?
3.What is the mass of the can?
Converting between moles and number of particles
involves multiplying or dividing by
6.02 x 1023
Converting between moles and mass involves multiplying or
dividing by
the molar mass of the substance
Convert from moles to mass
How much does 3.75 moles of magnesium metal weigh?
Convert from moles to mass
How much does 3.75 moles of magnesium metal weigh?
3.75 moles Mg
Convert from moles to mass
How much does 3.75 moles of magnesium metal weigh?
3.75 moles Mg
X
Convert from moles to mass
How much does 3.75 moles of magnesium metal weigh?
3.75 moles Mg
X 24.305 grams
1 mole Mg
Convert from moles to mass
How much does 3.75 moles of magnesium metal weigh?
3.75 moles Mg
X 24.305 grams
1 mole Mg
= 91.1 grams Mg
Convert from moles to mass
How much does 3.75 moles of magnesium metal weigh?
3.75 moles Mg
X 24.305 grams
1 mole Mg
= 91.1 grams Mg
WHERE THE HECK DID THIS COME FROM?!?
Convert from moles to mass
How much does 3.75 moles of magnesium metal weigh?
3.75 moles Mg
X 24.305 grams
1 mole Mg
= 91.1 grams Mg
WHERE THE HECK DID THIS COME FROM?!?
The periodic
table!
10.5Moles to grams
9.45 mol Al2O3 x ___________ = 964g Al2O3
1 mol Al2O3
102g Al2O3
2 Al = 54g
3 O = 48 g
102g
Grams to moles
Mole Review
huge #
of
particles
6x1023
6x1023
(g)grams(mass)molar
mass
molar mass
Use the periodic
table!
Use the mole
banner!
Convert from number of particles to mass in
grams
2.4 x 1024 atoms of As
Convert from number of particles to mass in
grams
2.4 x 1024 atoms of AsX 1 mole
6.02x1023
atoms
Convert from number of particles to mass in
grams
2.4 x 1024 atoms of AsX 1 mole
6.02x1023
atoms
Convert from number of particles to mass in
grams
2.4 x 1024 atoms of AsX 1 mole
6.02x1023
atoms
= 4 moles As
Convert from number of particles to mass in
grams
2.4 x 1024 atoms of AsX 1 mole
6.02x1023
atoms
= 4 moles As
Convert from number of particles to mass in
grams
2.4 x 1024 atoms of AsX 1 mole
6.02x1023
atoms
= 4 moles As X 74.9 grams
1 mole
Convert from number of particles to mass in
grams
2.4 x 1024 atoms of AsX 1 mole
6.02x1023
atoms
= 4 moles As X 74.9 grams
1 mole
Convert from number of particles to mass in
grams
2.4 x 1024 atoms of As
= 299.6 grams of Arsenic
X 1 mole
6.02x1023
atoms
= 4 moles As X 74.9 grams
1 mole
Convert from number of particles to mass in
grams
2.4 x 1024 atoms of As
= 299.6 grams of Arsenic ≈300g for multiple choice
X 1 mole
6.02x1023
atoms
= 4 moles As X 74.9 grams
1 mole
1. Calculate the mass in grams of a sample containing 1.85 x 1034 molecules of water.
a. 3.07 x 1010 g
b. 5.53 x 1011 g
c. 188 g
d. 8.46 x 103 g
10.2 Section Quiz.
2. Calculate the number of moles in a spoonful of table sugar (C12H22O11) having a mass of 10.5 g.a. 32.6 molb. 3.59 103 molc. 3.07 10–3 mold. 1.85 1022 mol
10.2 Section Quiz.
