Chapter 3
1.
What is the mass of 3.5 mol of copper?
2.
How many moles of gold are in 3.6 x 10
10
g of gold?
3.
How many moles of silver are in 3.01 x 10
23
atoms of silver?
4.
What is the mass in grams of 1.2 x 10
8
atoms of copper?
5.
What mass of gold contains the same number of atoms as 9.0 g of aluminum?
6.
What is the molar mass of barium nitrate?
7.
Ibuprofen, C
13
H
18
O
2
, is the active ingredient in many nonprescription pain
relievers.
Its molar mass is 206.29 g/mol.
b)
If the tablets in a bottle contain a total of 33 g of ibuprofen, how many
moles of ibuprofen are in the bottle?
c)
How many molecules of ibuprofen are in the bottle?
d)
What is the total mass in grams of carbon in 33 g of ibuprofen?
8.
Find the mass percentage of water in sodium carbonate decahydrate,
Na
2
CO
3
.
10H
2
O.
9.
Find the percentage composition of Lead(II) chloride and Barium nitrate.
10.
Magnesium hydroxide is 54.87% oxygen by mass.
How many grams of oxygen
are in 175 g of the compound?
How many moles of oxygen is this?
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 Spring '11
 saidane
 Atom, Mole

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