WorksheetsChapter 10 Test
Total questions: 59
Worksheet time: 1hrs 27mins
Name
Class
Date
1.
Avogadro’s number refers to the number of particles in one gram of a substance.
a)
True
b)
False
2.
One mole of a substance has the same number of particles as one mole of any other substance, regardless of what substances are being compared.
a)
True
b)
False
3.
Molar mass is the number of moles of a substance that would have a mass of 1 gram.
a)
True
b)
False
4.
An element’s molar mass is equivalent to the atomic number of the element.
a)
True
b)
False
5.
If the atomic mass of a manganese atom is 54.94 amu, then its molar mass is 54.94 g/mol.
a)
True
b)
False
6.
In order to convert the number of particles of a substance to the substance’s mass, it is necessary first to convert the number of particles to the number of moles.
a)
True
b)
False
7.
Which element has a molar mass of 30.974 g/mol?
a)
Potassium
b)
Gallium
c)
Phosphorus
d)
Palladium
8.
Which is the molar mass of the element Calcium?
a)
20.180 g/mol
b)
40.078 g/mol
c)
30.587 g/mol
d)
12.479 g/mol
9.
Which is the correct molar mass for the compound FeSO4?
a)
103.85 g/mol
b)
151.85 g/mol
c)
415.4 g/mol
d)
247.85 g/mol
10.
Which is the correct molar mass for the compound CaBr2?
a)
120 g/mole
b)
200 moles
c)
240 grams
d)
200 g/mole
11.
Which is the mass of 8 moles of sodium chloride?
a)
7.3 grams
b)
468 grams
c)
0.137 g/mole
d)
856 moles
12.
How many molecules are in 3.6 grams of NaCl?
a)
a
b)
b
c)
c
d)
d
13.
How many grams are in 1.946 moles of NaCl?
a)
113.8 g
b)
30.1 g
c)
0.033 g
d)
44.7 g
14.
Which compound has a molar mass of 174.3 g/mol?
a)
a
b)
b
c)
c
d)
d
15.
What is the SI base unit used to measure the amount of a substance?
a)
Kelvin
b)
Kilogram
c)
Meter
d)
Mole
16.
Calculate the number of molecules in 4.0 mol H2O.
a)
a
b)
b
c)
c
d)
d
17.
How many moles of Ag contain 4.49 x 10^23 atoms Ag?
a)
a
b)
b
c)
c
d)
d
18.
Copper (Cu) is a transition element used in the making of coins. Calculate the mass in grams of 0.0420 moles of copper.
a)
0.00697 g
b)
0.252 g
c)
2.67 g
d)
6.61 g
19.
How many moles of calcium are in 425 g calcium (Ca)?
a)
10.6 mol
b)
70.5 mol
c)
171 mol
d)
255 mol
20.
What is the molar mass of
a)
57.008 g/mol
b)
71.080 g/mol
c)
19.216 g/mol
d)
74.092 g/mol
21.
How many moles of oxygen are in 2.2 moles of potassium permanganate?
a)
2.2 mol
b)
8.8 mol
c)
4.4 mol
d)
10.10 mol
22.
Determine the number of moles present in 32.5 g aluminum chloride.
a)
0.244 mol
b)
4.10 mol
c)
1.21 mol
d)
720 mol
23.
What is the mass in grams of manganese (Mn) of
a)
1.12 g
b)
1.69 g
c)
.930 g
d)
93.0 g
24.
How many moles are present in 21.2 g of HCl?
a)
0.582 mol
b)
1.72 mol
c)
21.0 mol
d)
128 mol
25.
Calculate the number of moles of hydrogen in 4.0 mol H2O.
a)
4 mol
b)
8 mol
c)
2 mol
d)
6 mol
26.
How many sodium atoms are in 1 mol of sodium?
a)
12.08 x 10^18
b)
24.98 x 10^20
c)
6.02 x 10^23
d)
12.04 x 10^23
27.
Avogadro's number is...
a)
6.02 x 10^23
b)
6.02
c)
22
d)
Option 4
28.
Explain why this is not the correct dimensional analysis setup to determine the mass of 4.50 moles of KCl.
4 lines
29.
What is the empirical formula of a substance with the molecular formula C2H4?
a)
C2H2
b)
C2H2
c)
C1H1
d)
CH2
30.
What is the empirical formula of a substance with the molecular formula NaCl?
a)
Na2Cl
b)
NaCl2
c)
NaCl
d)
Na2Cl2
31.
What is the empirical formula of a substance with the molecular formula X20Y15?
a)
X10Y15
b)
X5Y3
c)
X4Y3
d)
X20Y15
32.
What is the empirical formula of a substance with the molecular formula Se8F12?
a)
Se8F12
b)
Se2F3
c)
Se4F3
d)
SeF
33.
What is the empirical formula of this substance?
a)
C2H3
b)
CH3
c)
C2H6
d)
C2H2
34.
What is the empirical formula for hydrogen peroxide (H2O2)?
a)
H2O
b)
H2O2
c)
HO
d)
HO2
35.
Which pair has the same empirical formula?
a)
NaCrO4 and Na2Cr2O7
b)
C2H4O2 and C6H12O6
c)
C3H6O3 and C2H6O2
d)
CH4 and C2H6
36.
Napthalene has the chemical formula C10H8. What would be the empirical formula?
a)
C10H8
b)
C5H4
c)
C20H16
d)
CH2
e)
C4H3
37.
Glucose has the formula C6H12O6. Maltose has the chemical formula C12H22O11. Do the have the same empirical formula?
a)
Yes
b)
No
38.
Which of these is NOT an empirical formula?
a)
CH2
b)
C2H5
c)
C6H4
d)
C3H7
e)
C5H17
39.
Which pair has the same empirical formula?
a)
NaCrO4 and Na2Cr2O7
b)
C2H4O2 and C6H12O6
c)
C3H6O3 and C2H6O2
d)
CH4 and C2H6
40.
A compound consists of 72.2% magnesium(Mg) and 27.8% nitrogen(N) by mass. What is the empirical formula?
a)
Mg4N3
b)
MgN2
c)
Mg3N2
d)
MgN
41.
You are given the following percentages: 40.05% S and 59.95% O. Find the empirical formula for these elements.
a)
SO
b)
SO2
c)
SO3
d)
SO4
42.
What is the molecular formula if the empirical formula is CH2O and the molecular molar mass is 180.18?
a)
CH2O
b)
C2H4O2
c)
C4H8O4
d)
C6H12O6
43.
Given the following: 42.07% Na, 18.89% P, and 39.04% O, determine the empirical formula.
a)
NaPO2
b)
Na2PO3
c)
Na3PO4
d)
NaPO4
44.
What is the molecular formula for a compound with the empirical formula: K2SO4 and a molecular mass of 696g.
a)
K2SO4
b)
K8SO16
c)
K8S4O8
d)
K8S4O16
45.
What is the empirical formula if you have 81.82% carbon and 18.18% hydrogen?
a)
C3H8
b)
CH4
c)
C2H2
d)
C4H10
46.
Glycerol has a molar mass of 92.09g/mol. Its percent composition is: 39.12% C, 8.75% H, and 51.12% O. What is the molecular formula for glycerol?
a)
C2H3O2
b)
CH2O
c)
C2H4O2
d)
C3H8O3
47.
Whats the empirical formula of a molecule containing 18.7% of Lithium, 16.3% of Carbon and 65.0% of oxygen?
a)
CO2Li3
b)
Li2CO3
c)
Li3CO2
d)
LiCO5
48.
Given the following: 42.07% Na, 18.89% P, and 39.04% O, determine the empirical formula.
a)
NaPO2
b)
Na2PO3
c)
Na3PO4
d)
NaPO4
49.
What is the percent by mass of oxygen in MgO? Hint: The attached image is an example of a worked problem other than this one.
a)
20%
b)
40%
c)
50%
d)
60%
50.
What is the percent by mass of magnesium in MgO?
a)
20%
b)
40%
c)
50%
d)
60%
51.
What is the percent by mass of fluorine in CaF2 (gram-formula mass = 78 g/mol)?
a)
24%
b)
49%
c)
51%
d)
65%
52.
What is the percent composition by mass of sulfur in the compound MgSO4 (gram formula mass = 120 g/mol)?
a)
20%
b)
27%
c)
46%
d)
53%
53.
What is the percent composition by mass of oxygen in the compound MgSO4 (gram formula mass = 120 g/mol)?
a)
20%
b)
27%
c)
46%
d)
53%
54.
In which compound is the percent composition by mass of Cl equal to 42%?
a)
HClO (gram formula mass = 52 g/mol)
b)
HClO2 (gram formula mass = 68 g/mol)
c)
HClO3 (gram formula mass = 84 g/mol)
d)
HClO4 (gram formula mass = 100 g/mol)
55.
Find the percent composition of Cu2S?
a)
%Cu= 67.987 %S= 32.013
b)
%Cu= 79.854 %S= 20.145
c)
%Cu= 35.946 %S= 64.054
56.
What is the percent composition of Benzene, C6H6?
a)
C = 50%
H = 50%
H = 50%
b)
C = 85.7 %
H = 14.3%
H = 14.3%
c)
C = 92.2%
H = 7.8%
H = 7.8%
d)
C = 71.9%
H = 28.1%
H = 28.1%
57.
What is the empirical formula for the following:
Pb5Cr5O20
Pb5Cr5O20
a)
Pb2Cr2O10
b)
PbCr2O7
c)
Pb9Cr4O2
d)
PbCrO4
58.
Which element has an abundance of 39.03% in the compound sodium phosphate, Na3PO4
a)
Na
b)
P
c)
O
d)
None of the above
59.
Which element in the compound potassium cyanide, KCN, has a percent composition of 60.97%?
a)
K
b)
C
c)
N
d)
None of the above
100 %
