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Final_Exam_B.docx-CHM 2046 Final Exam Form Code
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CHM 2046
Final Exam
Form Code B
Please bubble in your name, UFID, section number, and form code on the answer sheet using a #2 pencil.
R = 0.0821 (L
atm/mol
K) = 8.314 (J/K
mol), F = 96485 C/mol, ΔS
univ
= ΔS
sys
+ ΔS
surr
, ΔS
surr
= −ΔH
sys
T
ΔG = ΔG° + RTlnQ, ΔG° = −RTlnK, ΔG° = ΔH° − TΔS°, ΔG° = −nFE°, E = E° −
0.05#\$
logQ
1.
Which is/are not included in the Colonel’s six core concepts?
i.
The first law of thermodynamics
ii.
Concentration and life
iii.
The third law of thermodynamics
iv.
Mother nature hates vacuum
v.
Electrochemistry
a. i,v
b. ii, iii
c. ii, iv
d. iii, iv
e.
ii,
iii,
iv
2.
Calculate K
a1
for H
3
PO
4
. For PO
4
3–
, K
b1
= 2.4×10
–2
, K
b2
= 1.6×10
–7
and K
b3
= 1.4×10
–12
.
a. 2.4×10
–2
b. 4.2×10
–13
c. 1.9×10
–22
d.
7.1×10
–3
e. 6.3×10
–8
3.
The E° for the following half-reaction is 0.59 V. In an experiment at 25 °C, the voltage of a platinum
electrode in a 0.005 M KMnO
4
solution was found to be 0.78 V. What is the pH of the solution? Assume
the other electrode is SHE.
MnO
4
(aq) + 2H
2
O(l) + 3e
→ MnO
2
(s) + 4OH
(aq)
a. 9
b. 10
c.
11
d. 12
e. 13
4.
To the nearest whole number unit, what would you predict the pH of 1.0×10
–10
M H
2
SO
4
to be?
a. 9
b. 4
c.
7
d. 1
e. 10
5.
A membrane that transports only K
+
separates two solutions. One solution contains 0.15 M KCl, 0.25 M
NaNO
3
and 0.075 M Ca(NO
3
)
2
. The other solution contains 0.085 M Ca(NO
3
)
2
, 0.025 M KCl and 0.15 M
NaNO
3
. What is the membrane potential in mV?
a. 20
b.
46
c. 15
d. 23
e. 36
6.
As a fuel, H
2
produces only nonpolluting H
2
O when it burns. Moreover, it combines with O
2
in a fuel cell to
provide electrical energy. Calculate ΔH°, ΔS° and ΔG° per mol of H
2
at 298.0 K. S°(H
2
O) = 188.7 J/mol
K,
S°(H
2
) = 130.6 J/mol
K, S°(O
2
) = 205.0 J/mol
K, ΔH
f
°(H
2
O) = –241.8 kJ/mol.
a.
+241.8 kJ, +44.4 J/K, +228.6 kJ
b.
–120.9 kJ, –22.2 J/K, –114.3 kJ
c.
–241.8
kJ,
–44.4
J/K,
–228.6
kJ
d.
–483.6 kJ, –88.8 J/K, –457.2 kJ
e.
–241.8 kJ, +44.4 J/K, +114.3 kJ
7.
Water at high temperature has a K
w
= 6.25×10
-12
. The OH
concentration at this temperature is closest to:
a. 1.0×10
-7
M
b. 5.0×10
-6
M
c. 1.3×10
-12
M
d. 1.6×10
-6
M
e.
2.5×10
-6
M
8.
For the following balanced reaction: A (g) + B (g) ↔ C (g), 2 moles of A and 2.0 moles of B are mixed in a
0.5 L flask and allowed to reach equilibrium at room temperature. The equilibrium mixture contained 1.0
mole of C. In a second experiment, 2.0 moles of A are mixed with 1 mole of B in the same flask. How
many moles of C would be present in the equilibrium mixture?
a. 1.44 mol
b. 1.17 mol
c. 0.44 mol
d.
0.59 mol
e. 4.00 mol
9.
What is the pH of the solution that results when 22.0 g of CH
3
CO
2
Na are mixed with 85.0 mL of 1.0 M
CH
3
CO
2
H and diluted with water to 2.0 L? (K
a
of CH
3
CO
2
H = 1.8×10
-5
; MW of CH
3
CO
2
Na = 82 g/mol)
a. 2.9
b. 3.9
c. 4.6
d. 5.0
e.
5.2
10.
What is ΔG° for the net reaction in a chlor-alkali cell?
a. 211.3 kJ
b. −211.3 kJ
c. 102.3 kJ
d. −422.6 kJ
e.
422.6
kJ

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