Moles

1
Moles
Grams
Chemical Reactions
AMUs
Molecules Atoms
6
11
16
21
1
2
7
12
17
22
3
8
13
18
23
4
9
14
18
24
5
10
15
20
25
2
How many moles of carbon atoms do you have?
You have four moles of CO2
3
4 moles of carbon
You have four moles of CO2
4
How many moles of oxygen atoms do you have?
You have four moles of CO2
5
8 moles of oxygen
You have four moles of CO2
6

You have four moles of CO2
How many grams of carbon do you have?
7
48 grams of carbon
You have four moles of CO2
8

You have four moles of CO2
How many atoms of carbon do you have?
9
2.4 x 1024 carbon atoms
You have four moles of CO2
10

You have four moles of CO2
How many oxygen atoms do you have?
11
4.8 x 1024 oxygen atoms
You have four moles of CO2
12

You have 51 grams of Al2O3
How many moles of aluminum oxide do you have?
13
You have 51 grams of Al2O3
0.5 moles Al2O3
14

You have 51 grams of Al2O3
How many grams of aluminum do you have?
15
You have 51 grams of Al2O3
27 grams of aluminum
16

You have 51 grams of Al2O3
How many grams of oxygen do you have?
17
You have 51 grams of Al2O3
24 grams of oxygen
18

You have 51 grams of Al2O3
How many molecules of aluminum oxide do you have?
19
You have 51 grams of Al2O3
3.01 x 1023 molecules of aluminum oxide
20
You have 51 grams of Al2O3
How many oxygen atoms do you have?
21
You have 51 grams of Al2O3
9.03 x 1023 oxygen atoms
22
2 Na(s) Cl2(g) ? 2 NaCl(s)
If you have 23 g of sodium, how many grams of
chlorine gas do you need?
23
2 Na(s) Cl2(g) ? 2 NaCl(s)
35.5 g Cl
24
4 Fe 3 O2 ? 2 Fe2O3
111.7 grams of iron reacts completely with oxygen
in the air, turning to powdery red rust. What is
the mass of the rust?
25
4 Fe 3 O2 ? 2 Fe2O3
159.7 g of iron oxide
26
2 H2O ? 2 H2 O2
100 g of water is electrolyzed to release
hydrogen and oxygen as gasses. Afterwards, 10 g
of water remain. What is the mass of hydrogen
gas produced?
27
2 H2O ? 2 H2 O2
10 g H2
28
HCl NaOH ? NaCl H2O
1.0 L of 1.0 M HCl will be neutralized by how
much 0.1 M NaOH?
29
HCl NaOH ? NaCl H2O
10.0 L 0.1 M NaOH
30
H2SO4 NaOH ? Na2SO4 H2O
What mass of sodium hydroxide is needed to
neutralize 1.0 moles of sulfuric acid?
31
H2SO4 NaOH ? Na2SO4 H2O
80 g NaOH
32
H2O
What is the molecular mass of water?
33
H2O
18 AMU
34
An unknown element is found to have 113 protons,
113 electrons, and 175 neutrons. What is its
atomic mass?
35
288 AMUs
36
As
Arsenic has an atomic number of 33 and an atomic
mass of 75. How many neutrons are in an atom of
arsenic?
37
As
42 neutrons
38
73 g of magnesium burns completely in air. What
is the mass of the resulting magnesium oxide?
39
121 g MgO
40
How many AMU are in a gram?
41
6.02 x 1023 AMU 1 gram
42
SO2
What is the mass in grams of 1.8 x 1024 molecules
of sulfur dioxide?
43
SO2
192 g
44
Phosphoric acid is a strong acid. When 98 g are
dissolved in water, how many hydrogen atoms are
released into solution?
45
1.8 x 1024 atoms
46
A hydrocarbon has the formula CH3(CH2)nCH3 It is
found to have a molecular mass of 3320 AMU. How
long is the molecule, measured in carbon atoms?
47
237 carbon atoms
48
Two monosaccharides with the formula C6H12O6 join
together by dehydration synthesis, releasing a
water molecule in the process. What is the
molecular mass of the resulting disaccharide?
49
162 AMU
50
Hands-on question Measure out a million
billion billion molecules of water.
51
29.9 mL