Chemistry 111
Page
1
out of 8
Exam IV /Fall 2002
Answer Key
Bonus (1 point):
What holiday do we celebrate at the end of this month?
Hint…
Doc likes
sandwiches made with leftover turkey made the following way… Bread,
turkey, turkey, bread, turkey, turkey, bread…
☺
Thanksgiving!
1.
In the derivation of W = - n R T ln (V
2
/V
1
), we went in one particular step from…
W
=
−
P
ext
∫
dV
to…
W
=
−
P
gas
∫
dV
In order to do this, we assumed that…
the process is
reversible
.
(02 pts)
2.
In that same derivation, we went in another step from…
W
=
−
P
gas
∫
dV
to…
W
=
−
n R T
V
∫
dV
In order to do this, we assumed that…
the gas is
ideal
.
(02 pts)
3.
Finally, in that same derivation, we went from…
W
=
−
n R T
V
∫
dV
to…
W
=
−
n R T
dV
V
∫
In order to do this, we assumed that…
the process is
isothermal
.
(02 pts)

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