Student Center
|
Instructor Center
|
Information Center
|
Home
Visual Chemistry
Student Study Guide
Essential Study Partner
Key Equations
Professional Opportunities
Tutorial Site
Audio Glossary
Web Links
Online ChemSkill Builder
GradeSummit
Choose a Chapter
Chapter 1
Chapter 2
Chapter 3
Chapter 4
Chapter 5
Chapter 6
Chapter 7
Chapter 8
Chapter 9
Chapter 10
Chapter 11
Chapter 12
Chapter 13
Chapter 14
Chapter 15
Chapter 16
Chapter 17
Chapter 18
Chapter 19
Chapter 20
Chapter 21
Chapter 22
Chapter 23
Chapter 24
Chapter 25
Essential Study Partner
ELearning Session
Flashcards
Internet Exercises
Self Assessment A
Self Assessment B
Feedback
Help Center
Chemistry, 7/e
Raymond Chang, Williams College
Mass Relationships in Chemical Reactions
Self Assessment A
1
Determine the number of moles of aluminum in 0.2154 kg of Al.
A)
1.297 x 10
23
mol
B)
5.811 x 10
3
mol
C)
7.984 mol
D)
0.1253 mol
E)
7.984 x 10
-3
mol
2
How many phosphorus atoms are there in 2.57 g of P?
A)
4.79 x 10
25
B)
1.55 x 10
24
C)
5.00 x 10
22
D)
8.30 x 10
-2
E)
2.57
3
How many grams of acetylsalicylic acid (aspirin, C
9
H
8
O
4
) are present in 1.32 x 10
-2
mol of C
9
H
8
O
4
?
A)
1.32 x 10
-2
g
B)
2.38 g
C)
180.2 g
D)
7.33 x 10
-5
g
E)
None of the above.
4
Calculate the percent composition by mass of nitrogen in ammonium nitrate (NH
4
NO
3
).
A)
0.175%
B)
0.350%
C)
17.5%
D)
35.0%
E)
42.5%
5
A compound with a percent composition by mass of 87.5% N and 12.5% H was recently discovered. What is the empirical formula of this compound?
A)
NH
2
B)
N
2
H
3
C)
NH
D)
N
2
H
2
E)
N
2
H
6
What is the coefficient for CO
2
when the following chemical equation is properly balanced using the smallest set of whole numbers? C
4
H
10
+ O
2
----> CO
2
+ H
2
O
A)
1
B)
4
C)
6
D)
8
E)
12
7
What mass of copper nitrate would be produced from the complete reaction of 45.6 g of copper, according to the chemical reaction shown below? Cu + 2 AgNO
3
----> Cu(NO
3
)
2
+ 2 Ag
A)
0.72 g
B)
21.1 g
C)
98.7 g
D)
135 g
E)
187 g
8
Calculate the number of moles of H
2
O formed when 0.200 mole of Ba(OH)
2
is treated with 0.500 mol of HClO
3
according to the chemical reaction shown below. Ba(OH)
2
+ 2 HClO
3
----> Ba(ClO
3
)
2
+ 2 H
2
O
A)
1.00 mol
B)
0.600 mol
C)
0.500 mol
D)
0.400 mol
E)
0.200 mol
9
Ammonia is produced industrially from the reaction of nitrogen and hydrogen. Write the balanced chemical equation for this reaction, and determine the largest mass of NH
3
that could be produced from the reaction of 105 g of N
2
and 15.0 g of H
2
.
A)
28.4 g
B)
42.2 g
C)
63.8 g
D)
84.3 g
E)
128 g
2002 McGraw-Hill Higher Education
Any use is subject to the
Terms of Use
and
Privacy Policy
.
McGraw-Hill Higher Education
is one of the many fine businesses of
The McGraw-Hill Companies
.