triesault (njt298) – H13: Thermo  2nd Law – McCord – (53740)
1
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32
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before answering.
001
10.0 points
For a given transfer of energy, a greater change
in disorder occurs when the temperature is
high.
1.
True
2.
False
002
10.0 points
Entropy is a state function.
1.
False
2.
True
003
10.0 points
Place the following in order of increasing en
tropy.
1.
gas, solid, and liqiud
2.
gas, liqiud, and solid
3.
solid, liquid, and gas
4.
solid, gas, and liqiud
5.
liqiud, solid, and gas
004
10.0 points
Which substance has the higher molar en
tropy?
1.
They are the same
2.
Unable to determine
3.
Kr(g) at 298 K and 1.00 atm
4.
Ne(g) at 298 K and 1.00 atm
005
10.0 points
Calculate the standard entropy of vaporiza
tion of ethanol at its boiling point 352 K. The
standard molar enthalpy of vaporization of
ethanol at its boiling point is 40.5 kJ
·
mol
−
1
.
1.
+115 J
·
K
−
1
·
mol
−
1
2.

115 J
·
K
−
1
·
mol
−
1
3.

40.5 kJ
·
K
−
1
·
mol
−
1
4.
+40.5 kJ
·
K
−
1
·
mol
−
1
5.
+513 J
·
K
−
1
·
mol
−
1
006
10.0 points
Assuming that the heat capacity of an ideal
gas is independent of temperature, what is
the entropy change associated with lowering
the temperature of 2
.
25 mol of ideal gas atoms
from 102
.
13
◦
C to

35
.
27
◦
C at constant vol
ume?
Answer in units of J
/
K.
007
10.0 points
What is the entropy change associated with
the isothermal compression of 6
.
16 mol of
ideal gas atoms from 9
.
13 atm to 12
.
65 atm?
Answer in units of J
/
K.
008
10.0 points
What is the entropy change for freezing
6
.
33 g of C
2
H
5
OH at 158
.
7 K?
Δ
H
=

4600 J
/
mol.
Answer in units of J
/
K.
009
10.0 points
Suppose that 160 g of ethanol at 24
◦
C is mixed
with 245 g of ethanol at 60
◦
C at constant
atmospheric pressure in a thermally insulated
vessel.
What is the Δ
S
sys
for the process?
The specific heat capacity for ethanol is 2.42
J/g K. Answer in units of J
/
K.
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 Fall '07
 Fakhreddine/Lyon
 Thermodynamics, Energy, Entropy

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