Problem 7: In a study it was found that 39 percent of the coliform organisms died within 9 h and 67 percent died within 20 h. If the rate of die-off followed first-order kinetics and were proportional to the number remaining, how long would it take to obtain 99.9 percent reduction in coliform organisms?

Sustainable Energy
2nd Edition
ISBN:9781337551663
Author:DUNLAP, Richard A.
Publisher:DUNLAP, Richard A.
Chapter5: Some Basic Nuclear Physics
Section: Chapter Questions
Problem 11P: The measured decay rates of a radioactive material as a function of time are shown in the table...
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Answer question 7
Problem 5: Given the following laboratory data containing the disappearance of a chemical in water,
do the data fit a zero-order, first- order, or second-order rate expression? Provide sufficient
justification for your answer, and report the correct rate constant in the correct units.
Time, h
0
Concentration, mg/L 100
0.5
61
1
37
2
14
3
5
5.0 0.67
Problem 6: The radioactive nuclide P32 has a half-life of 15.3 days. How long would a waste
containing 10 mg/L of this nuclide have to be stored in order to reduce the concentration to 0.7
mg/L? (1
Problem 7: In a study it was found that 39 percent of the coliform organisms died within 9 h and
67 percent died within 20 h. If the rate of die-off followed first-order kinetics and were
proportional to the number remaining, how long would it take to obtain 99.9 percent reduction in
coliform organisms?
Transcribed Image Text:Problem 5: Given the following laboratory data containing the disappearance of a chemical in water, do the data fit a zero-order, first- order, or second-order rate expression? Provide sufficient justification for your answer, and report the correct rate constant in the correct units. Time, h 0 Concentration, mg/L 100 0.5 61 1 37 2 14 3 5 5.0 0.67 Problem 6: The radioactive nuclide P32 has a half-life of 15.3 days. How long would a waste containing 10 mg/L of this nuclide have to be stored in order to reduce the concentration to 0.7 mg/L? (1 Problem 7: In a study it was found that 39 percent of the coliform organisms died within 9 h and 67 percent died within 20 h. If the rate of die-off followed first-order kinetics and were proportional to the number remaining, how long would it take to obtain 99.9 percent reduction in coliform organisms?
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