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Moles Test Review
Moles Test Review
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Moles, Mole conversions, Empirical Formulas, Molecular Formulas, Percent Composition
Flashcards
26 cards
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Questions
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Answers
1
A sample has 5.5g of carbon and 14.5g of oxygen in a sample. What is the empricial formula?
CO2
NaCl
CO
C2O4
2
How many moles are in are in 2.016 g of hydrogen gas?
2 mol
1 mol
0.5 mol
5 mol
3
What is the percent of sulfur in sodium sulfide, Na
2
S?
33.3 %
58.9 %
41.1 %
66.7 %
4
How many formula units are in 2 mol of calcium oxide, CaO?
3.011 x 1023 formula units
1.204 x 1024 formula units
9.03 x 1023 formula units
22.4 L
5
What number is used from the Periodic Table to calculate the molar mass of substances?
Period
Atomic number
Group
Atomic mass
6
How many mol of potassium atoms, K, are present in 2.32 x 10
23
atoms?
.75 mol
1.5 mol
3 mol
.39 mol
7
A substance has a molecular mass of 42g/mol. If it is made of 85.7% C and 14.3% H, what would the molecular fomula be?
C3H6
C4H8
C2H4
CH2
8
The value for Avogadro's Number is ____________.
1.5 moles
22.4 particles
6.02 x 1023 particles
1.008 g/mol
9
How much percent of lithium chloride is from lithium, LiCl?
16.4 %
77.4 %
83.6 %
22.6 %
10
What is Avogadro's Number?
The amount of area occupied per mole of a substance
The amount of mass per mole of a substance
The number of particles per mole of a substance
The distance between energy levels for electrons
11
Which substance can be recognized by the specific particle called an atom?
Fluorine, F2
Lithium, Li
Calcium fluoride, CaF2
Methane, CH4
12
What is a mole in chemistry?
Skin bump
Furry animal
None of the choices
Amount of substance
13
A compound has an EmpF of NO
2
and a molecular mass of 92g/mol. What is the molecular formula?
N2O4
NO2
N4O8
N3O6
14
What is the molar mass of an oxygen molecule (O
2
)?
22.990 g/mol
31.998 g/mol
14.007 g/mol
15.999 g/mol
15
Which value is equal to 1 mol of any substance
22.4 x 1023 molecules
11.2 L
6.02 x 1023 particles
12.011 g
16
How many molecules are in 18.015 g of water?
3.011 x 1023 molecules
9.033 x 1023 molecules
6.02 x 1023 molecules
1.204 x 1024 molecules
17
How many grams are in 8.75 x 10
23
atoms of sulfur, S?
33.1 g
63.4 g
46.6 g
28.5 g
18
What is the molar mass of water?
15.999 g/mol
33.006 g/mol
18.015 g/mol
17.007 g/mol
19
Which of the following is used for particles of a nonmetals bonding to nonmetals?
molecules
formula units
atoms
gamma
20
This is the image of an aspirin molecule. How many Oxygen atoms are there in 15 molecules?
135 atoms
60 atoms
120 atoms
4 atoms
21
What is molar mass?
Mass of 1 mole of a substance
The average mass of a furry animal
The mass of your wisdom teeth
The mass of 100 moles of a substance
22
What are particles called for elements?
formula units
molecules
atoms
radiation
23
If iron (III) oxide has a molecular formula of Fe
2
O
3
, what is the empirical formula?
FeO3
FeO
Fe4O6
Fe2O3
24
What is the empirical formula for C
3
H
6
O
3
?
CH2O
CHO
C3H6O3
CHO4
25
A sample contains 67.3% potassium, K, and 32.7% fluorine, F. What is the empirical formula?
KF
K3F
K2F2
KF3
26
How many grams are in 0.5 mol of sodium chloride, NaCl?
88.5 g
20.5 g
116.886 g
29.222 g
