ECH 152A, Fall 2009, Roland Faller
Homework 6, October 30, 2009
Due: November 6, Beginning of Lecture
1. (6 points)
(a) Estimate Δ
H
◦
f
(298K) for the following liquids at 25C.
Acetylene,
n
Hexane, Styrene
(b) Determine the standard heat of reaction for the following:
N
2
(g)+3H
2
(g)
→
2NH
3
(g)
C
2
H
4
(g)+H
2
O(l)
→
C
2
H
5
OH(l)
N
2
(g)+C
2
H
2
(g)
→
2HCN(g)
2. (3 points)
Show that two lines representing reversible adiabatic processes in a
pV
diagram
cannot intersect. (Show if they intersect and you complete the cycle isothermally
you violate the 2
nd
law).
3. (6 points, This problem was on MT 2, 2008)
We run the following reaction
2NH
3
+
A
O
2
→
B
H
2
O +
C
NO
2
with a feed stream of (all percentages are molar ratios) 60% ammonia, 36%
oxygen and the rest nitrogen at 400
◦
C.
(a) Determine
A
,
B
and
C
.
(b) We now convert 60% of the ammonia isothermally. How much heat per mole
feed do we need. (Neglect any phase transitions in your calculations.)
4. (6 points, This problem was on MT 2, 2007)
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 Spring '09
 Faller
 Thermodynamics, 25%, 298 K, 36%, Roland Faller, reversible carnot engine

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