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containing 10 mg/L mg/L? (1

containing 10 mg/L mg/L? (1

Structural Analysis
Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Answer question 6 subject is Environmental Engineering
**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 | 0.5 | 1 | 2 | 3 | 5 | |---------|-----|-----|-----|-----|-----|-----| | Concentration, mg/L | 100 | 61 | 37 | 14 | 5.0 | 0.67 | **Problem 6:** The radioactive nuclide \( \text{P}^{32} \) 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? **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 | 0.5 | 1 | 2 | 3 | 5 | |---------|-----|-----|-----|-----|-----|-----| | Concentration, mg/L | 100 | 61 | 37 | 14 | 5.0 | 0.67 | **Problem 6:** The radioactive nuclide \( \text{P}^{32} \) 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? **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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