Version 086 – Final Exam – Holcombe – (52460)
2
4.
[A] = 0.50 M; [B] = 1.00 M
5.
[A] = 0.67 M; [B] = 1.33 M
correct
Explanation:
K
= 2
[A]
ini
= 1
.
0 M
[B]
ini
= 1
.
0 M
Q
=
[B]
[A]
=
1
.
0
1
.
0
= 1
.
0
< K
= 2
Therefore, the equilibrium moves to the right.
A
⇀
↽
B(g)
ini, M
1
.
0
1
.
0
Δ, M

x
x
eq, M
1
.
0

x
1
.
0 +
x
K
=
[B]
[A]
= 2
1
.
0 +
x
1
.
0

x
= 2
1
.
0 +
x
= 2
.
0

2
x
x
= 0
.
33
[A] = 1
.
0

x
= 0
.
67 M
[B] = 1
.
0 +
x
= 1
.
33 M
004
10.0 points
Which of the following gases are more soluble
in water when their partial pressure above the
solution is increased?
HI
,
SO
3
,
NH
3
,
O
2
,
NO
2
,
HF
,
Cl
2
1.
Cl
2
,
NO
2
,
SO
3
,
HI
2.
all of them
correct
3.
HI
,
NH
3
4.
NO
2
,
O
2
,
HI
5.
NO
2
,
SO
3
6.
SO
3
,
NO
2
,
HI
Explanation:
Henry’s Law states that the solubility of
gases increase as their partial pressure above
the solvent increases.
005
10.0 points
For the reaction
cyclopropane(g)
→
propene(g)
at 500
◦
C, a plot of ln[cyclopropane]
vs
t
gives
a straight line with a slope of

0
.
00067 s
−
1
.
What is the order of this reaction and what is
the rate constant?
1.
second order; 6
.
7
×
10
−
4
M
−
1
·
s
−
1
2.
second order; 6
.
7
×
10
−
2
M
−
1
·
s
−
1
3.
first order; 6
.
7
×
10
−
2
s
−
1
4.
first order; 6
.
7 s
−
1
5.
None of these
6.
second order; 6
.
7 M
−
1
·
s
−
1
7.
first order; 6
.
7
×
10
−
4
s
−
1
correct
Explanation:
006
10.0 points
When the reaction
CO
2
(g) + H
2
(g)
⇀
↽
H
2
O(g) + CO(g)
is
at
equilibrium
at
1800
◦
C,
the
equilib
rium concentrations are found to be [CO
2
]
= 0.24 M, [H
2
] = 0.24 M, [H
2
O] = 0.48 M,
and [CO] = 0.48 M. Then an additional 0
.
45
moles per liter of CO
2
and the same amount
of H
2
are added. When the reaction comes to
equilibrium again at the same temperature,
what will be the molar concentration of CO?
1.
0
.
873 M
2.
0
.
82 M
3.
0
.
86 M
4.
0
.
793 M
5.
0
.
78 M
correct