Your laboratory is asked to analyze a water sample for a particular pesticide. You knowfrom previous study that this pesticide degrades via a first order, irreversible reaction. Thefirst order rate constant (k) for the reaction at 4 °C is 0.02 day¹. The activation energy forthe reaction is known to be 10 kcal/mol. The standard preservation method for watersamples containing this pesticide is to store the sample at 4 °C for no more than 24 hoursprior to analysis.Calculate the fraction of the pesticide that remains in the sample after 24 hours of storageat 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) overthe weekend. 60 hours later the sample is analyzed and found to contain 0.01 mg/L ofthe pesticide. What was the pesticide concentration in the water at the time the samplewas taken?

a) Here initial concentration (t=0) of pesticide is a0. After time 24 hrs (t1) the concentration of…

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

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

See similar textbooks

Similar questions

During a chemical reaction the temperature drops from 26 oC to 14 oC. What can you conclude about the reaction? It has a high activation energy It is a combination reaction It is an endothermic reaction It is an exothermic reaction
A chemistry graduate student is studying the rate of this reaction: 2HI (g) → H, (g) +I, (g) He fills a reaction vessel with HI and measures its concentration as the reaction proceeds: time [HI] (minutes) 0.500M 1.0 0.241 M 2.0 0.159M 3.0 0.119 M 4.0 0.0946 M
A chemistry graduate student is studying the rate of this reaction: 2H₂PO4 (aq) → P₂O₂ (aq) + 3H₂O (aq) He fills a reaction vessel with H₂PO4 and measures its concentration as the reaction proceeds: time (seconds) [H₂PO4] 0 0.700M 10. 0.273 M 20. 0.170M 30. 0.123 M 40. 0.0967M Use this data to answer the following questions. Write the rate law for this reaction. x10 Calculate the value of the rate constant k. Round your answer to 2 significant digits. Also be sure your answer has the correct unit symbol. X rate = k k = 0 ?
mm
Measuring total pressure is a convenient way to monitor gas reaction: 2NOCl(g) → 2NO(g) + Cl2(g). The rate of the reaction depends on the concentration of the reactant, which is proportional to the partial pressure of the reactant. Derive a relation connecting its velocity above reaction with initial pressure, P0, and total pressure, Pt, at time t.(Hint: Assume the reaction is 2nd order. Make a table with initial (t0) and final values (t) of the moles of NOCl, NO, and Cl2, and construct the ideal gas equations for both cases. Use the ideal gas equation for t0 so that calculate the initial concentration of NOCl and substitute this value into the equation of ideal gases for t)
Calculate the average rate of a reaction, given the following data: Reaction Data Time (s) Concentration (mol/L) 60 5.00 × 10-² 85 3.25 x 10-²
The rate constant k for a certain reaction is measured at two different temperatures: temperature k 142.0 °C 6.1 x 1011 226.0 °C 3.7 x 10¹2 Assuming the rate constant obeys the Arrhenius equation, calculate the activation energy E for this reaction. Round your answer to 2 significant digits. mol ×
HO- Identify the functional groups in the above compound. i. Carboxylic acid i. Ether ii. Alcohol iv. Amide v. Amine i, ii, l and v iivand v O-1m, iv and v
If the following chemical reactions have the same activation energy, which of them is likely to be faster at a given temperature? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a b с d A(g) + 2B(g) → AB₂(g) A(g) + B(g) + C(g) → ABC(g) AB(g) + B(g) → AB₂(g) All will proceed at the same rate
The rate of the reaction N₂O5(g) →2 NO₂(g) + 1/2 0₂(g) is measured at different temperatures, with the following rate constants, k, determined: Temperature, K 298 328 358 378 Recheck k, s-1 1st attempt 3.46 x 10-5 1.5 x 10-3 3.34 x 10-2 0.21 Use the graphing tool above to make an appropriate plot and determine the activation energy, E, for this reaction in units of kilojoules_ X kJ/mol 4 Next) (1 of 1) Show Approach Select functions for the x-axis and the y-axis and create the plot that can be used to find the activation energy. The Arrhenius equatic Ea F/R (1) In k = In A - Inc y=b+mx
Hand written solutions are strictly prohibited.
A chemistry graduate student is studying the rate of this reaction: NH,ОH (аq) — NH; (аq)+ н,о (аq) She fills a reaction vessel with NH,OH and measures its concentration as the reaction proceeds: time [NH,OH] (seconds) 0.0600M 0.10 0.0385 M 0.20 0.0247M 0.30 0.0158M 0.40 0.0101 M Use this data to answer the following questions. Write the rate law for this reaction. rate = k || x10 Calculate the value of the rate constant k. k = Round your answer to 2 significant digits. Also be sure your answer has the correct unit symbol.