Your laboratory is asked to analyze a water sample for a particular pesticide. You know from previous study that this pesticide degrades via a first order, irreversible reaction. The first order rate constant (k) for the reaction at 4 °C is 0.02 day. The activation energy for the reaction is known to be 10 kcal/mol. The standard preservation method for water samples containing this pesticide is to store the sample at 4 °C for no more than 24 hours prior to analysis. a. Calculate the fraction of the pesticide that remains in the sample after 24 hours of storage at 4 °C. b. A newly hired staff member collects a sample of the water but forgets to store it at 4 °C. Instead, they leave the sample in the trunk of their car (average temperature 35 °C) over the weekend. 60 hours later the sample is analyzed and found to contain 0.01 mg/L of the pesticide. What was the pesticide concentration in the water at the time the sample was taken?
Your laboratory is asked to analyze a water sample for a particular pesticide. You know from previous study that this pesticide degrades via a first order, irreversible reaction. The first order rate constant (k) for the reaction at 4 °C is 0.02 day. The activation energy for the reaction is known to be 10 kcal/mol. The standard preservation method for water samples containing this pesticide is to store the sample at 4 °C for no more than 24 hours prior to analysis. a. Calculate the fraction of the pesticide that remains in the sample after 24 hours of storage at 4 °C. b. A newly hired staff member collects a sample of the water but forgets to store it at 4 °C. Instead, they leave the sample in the trunk of their car (average temperature 35 °C) over the weekend. 60 hours later the sample is analyzed and found to contain 0.01 mg/L of the pesticide. What was the pesticide concentration in the water at the time the sample was taken?
Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter11: Chemical Kinetics: Rates Of Reactions
Section: Chapter Questions
Problem 11.ACP: (Section 11-5) A rule of thumb is that for a typical reaction, if concentrations are unchanged, a...
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![Your laboratory is asked to analyze a water sample for a particular pesticide. You know
from previous study that this pesticide degrades via a first order, irreversible reaction. The
first order rate constant (k) for the reaction at 4 °C is 0.02 day¹. The activation energy for
the reaction is known to be 10 kcal/mol. The standard preservation method for water
samples containing this pesticide is to store the sample at 4 °C for no more than 24 hours
prior to analysis.
Calculate the fraction of the pesticide that remains in the sample after 24 hours of storage
at 4 °C.
b. A newly hired staff member collects a sample of the water but forgets to store it at 4 °C.
Instead, they leave the sample in the trunk of their car (average temperature 35 °C) over
the weekend. 60 hours later the sample is analyzed and found to contain 0.01 mg/L of
the pesticide. What was the pesticide concentration in the water at the time the sample
was taken?](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F2ebe91de-3090-46ac-907f-d0393c4d1db8%2Ffeb3a46d-d7fe-4cc2-8f26-0e3aae573cb1%2F6a3tyz_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Your laboratory is asked to analyze a water sample for a particular pesticide. You know
from previous study that this pesticide degrades via a first order, irreversible reaction. The
first order rate constant (k) for the reaction at 4 °C is 0.02 day¹. The activation energy for
the reaction is known to be 10 kcal/mol. The standard preservation method for water
samples containing this pesticide is to store the sample at 4 °C for no more than 24 hours
prior to analysis.
Calculate the fraction of the pesticide that remains in the sample after 24 hours of storage
at 4 °C.
b. A newly hired staff member collects a sample of the water but forgets to store it at 4 °C.
Instead, they leave the sample in the trunk of their car (average temperature 35 °C) over
the weekend. 60 hours later the sample is analyzed and found to contain 0.01 mg/L of
the pesticide. What was the pesticide concentration in the water at the time the sample
was taken?
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