 2 
NAME_________________________
1.)
If the following statements are True, place a T in the line before the statement.
If False,
place an F.
T
±
G
=
±
H
–
T
±
S
is an equation that describes the second law of thermodynamics under
constant
T
and
P
.
F
In an ice/water mixture at 0°C,
G
ice
=
G
water
.
F
Entropy of water increases when you add a hydrophobic molecule.
F
The Helmholtz equation relates the pressure dependence of
±
G
to
±
V
.
T
Increasing pressure on condensed matter always increases its Gibbs Energy.
T
In a
P
vs
T
phase diagram a quadruple point (four phases existing simultaneously) can
exist for a 2component system.
F
Water freezes spontaneously at 5°C, therefore
±
S
sys
is positive.
2.
Refer to the following reaction coordinate diagram for the questions below.
Place answers in
box next to questions. Give answers in nearest kJ/mol.
What is
±
r
G
for A
±
B
What is the transition state energy for A
±
B
If this graph represented an uncatalyzed
reaction, calculate the
±
r
G
for an enzyme
catalyzed reaction of A
±
B
+10
+25
+10
Free Energy (kJ/mol)
Reaction Coordinate
A
B
10
20
30
40
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NAME_________________________
For questions 3  5, circle the correct answer.
3.
The molar heat of vaporization of ethanol is 39.3 kJ·mol
1
, and the boiling point is 78.3°C.
What
is the
±
vap
S
for the vaporization of 0.5 mole of ethanol?
a.) 0.50 J·K
1
b.) 0 J·K
1
(Because isothermal)
c.) 112 J·K
1
d.) 56 J·K
1
e.) 502 J·K
1
4.
Which of the following quantities can have a value of zero in the standard state?
I)
±
f
H
o
II)
±
f
G
o
III)
S
o
a. I only
b. II only
c. III only
I and II
e. all three
5.) Which statement or equation best describes the second law of thermodynamics?
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 Fall '10
 FISHER
 Thermodynamics, Entropy, ln ln, Torr P2 ln

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