II RevieW I Constants I Periodic Table Ethyl chloride vapor decomposes by the first-order reaction C2H5C1 → C2H4 + HC1 Part A The activation energy is 249 kJ/mol and the frequency factor is 1.6 x 1014s-! Find the value of the specific rate constant at 730 K . Express your answer using two significant figures. k = 2.4x10-4 s1 Previous Answers Submit v Correct Correct answer is shown. Your answer 2.43-10= 2.43x10-4 swas either rounded differently or used a different number of significant figures than required for this part. Important: If you use this answer in later parts, use the full unrounded value in your calculations. Part B Find the fraction of the ethyl chloride that decomposes in 10 minutes at this temperature. Express your answer using one significant figure. femplaes Symbols uado redo reset keyboard shortcuts help [C2H5CI]0–[C2H5CIJE [C2H5C1]0 Request Answer Submit Part C Find the temperature at which the rate of the reaction would be twice as fast. Express your answer using two significant figures. fempla es Symbols uado redo reset keyboard shortcuts help T = K Request Answer Submit

II RevieW I Constants I Periodic Table Ethyl chloride vapor decomposes by the first-order reaction C2H5C1 → C2H4 + HC1 Part A The activation energy is 249 kJ/mol and the frequency factor is 1.6 x 1014s-! Find the value of the specific rate constant at 730 K . Express your answer using two significant figures. k = 2.4x10-4 s1 Previous Answers Submit v Correct Correct answer is shown. Your answer 2.43-10= 2.43x10-4 swas either rounded differently or used a different number of significant figures than required for this part. Important: If you use this answer in later parts, use the full unrounded value in your calculations. Part B Find the fraction of the ethyl chloride that decomposes in 10 minutes at this temperature. Express your answer using one significant figure. femplaes Symbols uado redo reset keyboard shortcuts help [C2H5CI]0–[C2H5CIJE [C2H5C1]0 Request Answer Submit Part C Find the temperature at which the rate of the reaction would be twice as fast. Express your answer using two significant figures. fempla es Symbols uado redo reset keyboard shortcuts help T = K Request Answer Submit

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 115QRT

See similar textbooks

Similar questions

11.48 The following data were collected for the decomposition of NT),-: Time, f (min) [N2Os] (mol L-1) 0 0.200 5 0.171 10 0.146 15 0.125 20 0.106 25 0.0909 30 0.0777 35 0.0664 40 0.0570 Use appropriate graphs to determine the rate constant for this reaction. Find the half-life of the reaction.
Nitroglycerine is an extremely sensitive explosive. In a series of carefully controlled experiments, samples of the explosive were heated to 160 C and their first-order decomposition studied. Determine the average rate constants for each experiment using the following data: Initial [C3H5N3O9] (M) 4.88 3.52 2.29 1.81 5.33 4.05 2.95 1.72 t (s) 300 300 300 300 180 180 180 180 %Decomposed 52.0 52.9 53.2 53.9 34.6 35.9 36.0 35.4
The following experimental data were obtained for the reaction of \'I14* and NOf in acidic solution. NH/(aq) + NO2-(aq) — N;(g) + 2 H,O(f) INH/I (mol L1) [NO21 (mol L-1, Rate = A[NJ/At (mol L-1 s’) 0.0092 0.098 3.33 X IO"7 0.0092 0.049 1.66 X 10‘7 0.0488 0.196 3.51 X 10"6 0.0249 0.196 1.80 X 10-6 Determine the rate law for this reaction and calculate the rate constant.
A drug decomposes in the blood by a first-order process. A pill containing 0.500 g of the active ingredient reaches its maximum concentration of 2.5 mg/ 100 mL of blood. If the half-life of the active ingredient is 75 min, what is its concentration in the blood 2.0 h after the maximum concentration has been reached?
Experiments have shown that the average frequency of chirping by a snowy tree cricket (Oecanthus fultoni) depends on temperature as shown in the table. Chirping Rate (per min) Temperature (C) 178 25.0 126 20.3 100. 17.3 What is the apparent activation energy of the process that controls the chirping? What is the rate of chirping expected at a temperature of 7.5C?
In the PhET Reactions under Options. (a) Leave the Initial Temperature at the default setting. Observe the reaction. Is the rate of reaction fast or slow? (b) Click Pause" and then Reset All, and then enter 15 molecules of A and 10 molecules of BC once again. Select Show Bonds" under Options. This time, increase the initial temperature until, on the graph, the total average energy line is completely above the potential energy curve. Describe what happens to the reaction.
Consider a 5.000 M solution of the hypothetical com- pound R. Its decomposition is a second-order reaction and its activation energy is 57.6 kJ/mol. At 759C, the half-life of the 5.000 M solution is 8.49 h. What is the half-life of the same solution at 700C (3 significant figures)?
Use the data provided in a graphical method to determine the order and rate constant of the following reaction: 2PQ+W Time (s) 9.0 13.0 18.0 22.0 25.0 [P] (M) 1.077103 1.068103 1.055103 1.046103 1.039103
For a certain reaction, Ea is 135 kJ and H=45 kJ. In the presence of a catalyst, the activation energy is 39% of that for the uncatalyzed reaction. Draw a diagram similar to Figure 11.14 but instead of showing two activated complexes (two humps) show only one activated complex (i.e., only one hump) for the reaction. What is the activation energy of the uncatalyzed reverse reaction?
Regular ?ights of supersonic aircraft in the stratosphere ale of concern because such aircraft produce nitric oxide, NO, as a byproduct in the exhaust of their engines. Nitric oxide reacts with ozone, and it has been suggested that this could contribute to depletion of the ozone layer. The reaction NO+O3NO2+O2 is first order with respect to both NO and O3 with a rate constant of 2.20107 L/mol/s. What is the instantaneous rate of disappearance of NO when [NO]=3.3106 M and [O3]=5.9107M?
The uncoiling of deoxyribonucleic acid (DNA) is a first-order reaction. Its activation energy is 420 kJ. At 37C, the rate constant is 4.90104min1 (a) What is the half-life of the uncoiling at 37C (normal body temperature)? (b) What is the half-life of the uncoiling if the organism has a temperature of 40C(104F)? (c) By what factor does the rate of uncoiling increase (per C) over this temperature interval?
The plot below shows the number of collisions with a particular energy for two different temperatures. a. Which is greater, T2 or T1? How can you tell? b. What does this plot tell us about the temperature of the rate of a chemical reaction? Explain your answer.