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BMB428
Dr. Song Tan
Physical Chemistry with Biological Applications
Fall 2007
(edited 9/26/06)
Problem Set 6: Enthalpy, Thermochemistry & more Math
Due Sept 18, 2007
Enthalpy
1.
We can define a useful quantity, enthalpy, as
HUP
V
=+
(a)
Prove that
()
∂
H
V
T
=
0
for an ideal monoatomic gas.
(b)
For a real gas, would
H
V
T
=
0?
For this problem, assume that the real gas follows the equation
PV nb
nRT
−
=
2.
1 liter of a fixed amount of an ideal monoatomic gas is allowed to expand at constant temperature
from 3 atm to a final pressure of 1 atm.
What is
∆
H if
(a)
the process is performed reversibly,
(b)
the process is performed irreversibly.
3.
From the information in Table 33 (attached), calculate the enthalpy change (at standard temperature
and pressure) for the following reactions.
In both reactions, the sugar is glucose.
(a)
C
6
H
12
O
6
(s) + 6O
2
(g) –> 6CO
2
(g) + 6H
2
O (l)
(b)
C
6
H
12
O
6
(s) + 3O
2
(g) –> 6CO (g) + 6H
2
O (l)
(c)
Is aerobic or anaerobic respiration more energy efficient?
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 Fall '07
 TAN

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