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Chem 110C
Spring 2010
Ames
1
Problem Set 3 (due Wed. May 5, 2010)
1. [a] Calculate
H
and
S
G
∆
∆
∆
,
per mol of benzene added for the process where an infinitesimal
quantity of benzene is added at 298K to an ideal solution composed of 0.4 mol benzene and 0.6 mol
toluene (Hint:
*
ln
benzene
s
benzene
G
µ
−
=
∆
and
T
n
P
T
G
S
,
⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛
∆
=
∆
δ
).
[b] Calculate
H
and
S
G
∆
∆
∆
,
per mol of benzene added for the process where 0.4 mol of pure
benzene is mixed with 0.6 mol of pure toluene to form an ideal solution. (Hint: see
∆
mix
G for the
standard mixing process, p977 of M&S.).
2. A natural uranium sample contains 0.7 mol percent of
235
U and 99.3 mol percent of
238
U.
First,
calculate the molar Gibbs free energy change (
G
mix
∆
) and molar entropy change (
S
mix
∆
) for the
mixing of
235
U and
238
U to form a natural (ideal) mixture (i.e. mol fraction of
235
U (x
1
) is 0.007 and
mol fraction of
238
U (x
2
) is 0.993).
Then calculate the entropy change (per mol of mixture) for
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 Spring '09
 Ame

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