More Sample Exam#1 Problems
Problem #6
Two blocks of metal, one with a heat capacity of 2000.0 J/K and an initial
temperature of 700.0 K, and the second with a heat capacity of 500.0 J/K at a temperature of
200.0 K are brought into thermal contact.
a)
What is the final temperature of the blocks after thermal equilibrium is reached?
T
final
= _____________ K
b)
What is the entropy change of the Universe resulting from this procedure?
∆
S
Universe
= _____
____
______ J/K
Problem #7
Often, meteorologists treat the first 10 km of the Earth’s atmosphere as isentropic.
If this is true, and the conditions at sea level are p=1.000 atm and T = 300.0 K, estimate the
temperature of the atmosphere at an altitude of 10 km where the pressure is 0.275 atm.
Assume the air is an ideal gas with a molar constantvolume heat capacity,
V
C
, of (5/2)R.
T
10km
= ____________________K
Problem #8
Consider a gas that obeys the following equation of state:
nRT
)
nb
V
(
p
=

where
b
is a positive constant specific to the gas.
Indicate whether the following statements regarding this gas are true or false:
________
The compressibility factor, Z, for this gas is always greater than one.
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 Fall '08
 OHRN
 Physical chemistry, Thermodynamics, pH, heat sink, Tfinal

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