Chemistry 342
Fall 2010, September 17
First Exam
(no electronic devices are allowed to use – calculators, iPods, cell phones, etc.)
1. a) How would you prove that heat is (not) a state variable? Can it be improved?
How?
b) What can you say about the mutual relationship of the coefficients in the exact
differential dU for a nonideal gas?
c) If you have an ideal gas, what can you say about the dependence of C
P
(T)?
Why?
What if the gas is nonideal?
d) Explain when and why gas can not be considered ideal.
Why C
P
≠
C
V
in an ideal gas? What do you think determines the value of C
V
?
2. a) Draw a phase diagram in PVT coordinates that describes some system of interest
around its critical point and explain in detail the figure.
b) Draw several isotherms in the phase diagram from a) and explain how you could
describe the isotherms exactly (in principle). Which equation could you use to
describe them approximately?
How would you use it?
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 Spring '08
 PRESTONSNEE
 Physical chemistry, Electron, pH, Trigraph, molar fraction XA

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