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Chapter 8: Multiple Reactions
What Type of Reaction is Taking Place?
Three species were found in a CSTR. The following concentration data were
obtained as a function of temperature. The initial concentration of the single
reactant, A, was the same at all temperatures. Both B and C are products.
CA0 = 2moles/dm3
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Run
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T (oC)
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CA (mole/dm3)
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CB (mole/dm3)
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CC (mole/dm3)
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1
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30
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1.7
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0.01
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0.29
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2
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50
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1.4
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0.03 |
0.57
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3
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70
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1.0
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0.1
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0.90
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4
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100
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0.5
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1.25
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1.25
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5
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120
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0.1
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1.80
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0.1
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6
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130
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0.01
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1.98
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0.01
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Explain the above data, what type of reaction is taking place, independent,
complex, series or parallel ?
Hint 1: What are the trends?
Hint 2: What do the trends suggest?
Hint 1
Observations
At low temperatures
1) Little conversion of A
2) Little B formed
3) Mostly C formed (but not too much because of the low conversion - 15 to 30% - of A)
At high temperatures
1) Virtually complete conversion of A
2) Mostly B formed
Hint 2
Data suggest 2 reactions
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Solution
Observations
At low temperatures
1) Little conversion of A
2) Little B formed
3) Mostly C formed (but not too much because of the low conversion - 15 to 30% - of A)
At high temperatures
1) Virtually complete conversion of A
2) Mostly B formed
Data suggest 2 reactions
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Reaction (1) is dominant at high temperatures
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with
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Reaction (2) is dominant at low temperatures
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