Midterm
CHE 36
Name:________________________
Closed book and notes
Friday, February 16, 2007
1 (20 points) You are running A → B + C in a liquid phase, constant density CSTR.
You have postulated that the rate is r
A
= kC
A
α
.
At a particular space time you have found
that the exit concentration of A is ½ that of the inlet concentration.
When you double the
space time, at the same inlet concentration, you find that the exit concentration of A
drops to ¼ of the inlet value.
Calculate the numerical value for α
.
2 (45 points) The gas phase reaction A → 6B is going to be used to inflate a balloon.
The reaction is second order with a rate expression r
A
= k C
A
2
.
We will consider the
balloon to be a variable volume batch reactor at constant pressure with an initial volume
of 50 cm
3
of pure A.
How long will it take
the volume to reach 250 cm
3
if kC
A0
is equal
to 32 min
1
?
In finding this time, also complete the following.
a)
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 Winter '09
 Fowler
 Chemical Engineering, pH, 1 L, constant density CSTR, 0.00367 L

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