Hydrogen peroxide (H;O;) decomposes into water and awygen.H,O;(a9) + H0(1) + 1/2 0,(a)Ordinarily, this reaction proceeds rather slowty, but in the presence of some iodide ions (I ), the decomposition is much faster. The decomposition in the peesence of indide was studied at 20 C, and the data were plotted in various ways. Lise the graphs helow to answer the questions that follow.M (mol/L)1/M (L/mal)0.-0.50.1406--0.55-044-1.5-0.33-0242-Tlme (s)Tlme (s)Tlme (s)1003000001000001003000a What is the order of reaction for the decomposition of hydrogen peroxide?O zero-oderO first-onderOsecond-cederb. Find the numerical value of the rate constant at 20'C, including the correct units. (Enter an uneounded value.)k=C. Cbeain an estimate of the initial rate of reaction in the experiment that penduced the graphs (i.e, the rate at = 0 in the graphs) (Enter an unrounded value.)rate =Jmol - L

a.The reaction is first order as graph of lnM verses time graph is straight line. b. rate constant…

Hydrogen peroxide (H;O2) decamposes into water and owygen. H,O;(ag) + H0(1) + 1/2 0,(a) Ordinarily, this reaction proceeds rather slowty. hut in the presence of some iodide ions (I , the decompositicn is mach faster. The decomposition in the peesence of indide was studied at 20 C, and the data were plotted in various ways. Lise the graphs helow to answer the questions that follow. M (mol/L) 1/M (L/mol) 0. -0.5 014 1. 0.6 0.5 5- 04 -1.5- 03 3- 024 2- Tlme (s) Tlme (s) Tlme (s) 100 300 600 100 290 500 000 600 a What is the order of reaction for the decomposition of hydrogen peroxide? O zero-onder O first-order O second-ceder b. Find the numerical value of the rate constant at 20C, including the correct units. (Enter an uneounded value.) k= c. Ckeain an estimate of the initial rate of reaction in the experiment that penduced the graphs (i.e, the rate at e= 0 in the graphs) (Enter an unrounded value.) rate = Jmol · L

Hydrogen peroxide (H;O2) decamposes into water and owygen. H,O;(ag) + H0(1) + 1/2 0,(a) Ordinarily, this reaction proceeds rather slowty. hut in the presence of some iodide ions (I , the decompositicn is mach faster. The decomposition in the peesence of indide was studied at 20 C, and the data were plotted in various ways. Lise the graphs helow to answer the questions that follow. M (mol/L) 1/M (L/mol) 0. -0.5 014 1. 0.6 0.5 5- 04 -1.5- 03 3- 024 2- Tlme (s) Tlme (s) Tlme (s) 100 300 600 100 290 500 000 600 a What is the order of reaction for the decomposition of hydrogen peroxide? O zero-onder O first-order O second-ceder b. Find the numerical value of the rate constant at 20C, including the correct units. (Enter an uneounded value.) k= c. Ckeain an estimate of the initial rate of reaction in the experiment that penduced the graphs (i.e, the rate at e= 0 in the graphs) (Enter an unrounded value.) rate = Jmol · L

Chemistry for Engineering Students

4th Edition

ISBN:9781337398909

Author:Lawrence S. Brown, Tom Holme

Publisher:Lawrence S. Brown, Tom Holme

Chapter11: Chemical Kinetics

Section: Chapter Questions

Problem 11.52PAE: Hydrogen peroxide (H20i) decomposes into water and oxygen: H,O2(aq) — H,O(f) + ^O2(g) Ordinarily...

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Hydrogen peroxide (H20i) decomposes into water and oxygen: H,O2(aq) — H,O(f) + ^O2(g) Ordinarily this reaction proceeds rather slowly, hut in the presence of some iodide ions (I-), the decomposition is much faster. Ihe decomposition in the presence of iodide was studied at 20°C, and the data were plotted in various ways. Use the graphs below to answer the questions that follow. What is the order of reaction for the decomposition of hydrogen peroxide? Find the numerical value of the rate constant at 20°C, including the correct units. Obtain an estimate of the initial rate of reaction in the experiment that produced the graphs (i.e., the rate at t = 0 in the graphs).
A catalyst reduces the activation energy of a reaction from 215 to 206 kJ. By what factor would you expect the reaction-rate constant to increase at 25 C? Assume that the pre-exponential term (A) is the same for both reactions. (Hint: Use the formula ln k = ln A Ea/RT.)
For the reaction AB+C, the following data were obtained at 30 C: [A] (M) 0.230 0.356 0.557 Rate (moI/L/s) 4.17104 9.99104 2.44103 (a) What is the order of the reaction with respect to [A], and what is the rate equation? (b) What is the rate constant?
The rate constant at 325 C for the decomposition reaction C4H82C2H4 is 6.1108s1, and the activation energy is 261 kJ per mole of C4H8. Determine the frequency factor for the reaction.
11.44 A possible reaction for the degradation of the pesticide DDT to a less harmful compound was simulated in the laboratory. The reaction was found to be first order, with k = 4.0 X 10_H s"' at 25°C. What is the half-life for the degradation of DDT in this experiment, in years?
A substance undergoes first-order decomposition. After 40.0 min at 500°C, only 12.5% of the original sample remains. YYliat is the half-life of the decomposition? If the original sample weighed 243 g, how much would remain after 2.00 h?
For the reaction QW+X, the following data were obtained at 30 C: [Q]initial (M) 0.170 0.212 0.357 Rate(mol/L/s) 6.68103 1.04102 2.94102 (a) What is the order of the reaction with respect to [Q], and what is the rate equation? (b) What is the rate constant?
Experiments during a recent summer on a number of fireflies (small beetles, Lampyridaes photinus) showed that the average interval between flashes of individual insects was 16.3 s at 21.0C and 13.0 sat 27.8C. a. What is the apparent activation energy of the reaction that controls the flashing? b. What would be the average interval between flashes of an individual firefly at 30.0C? c. Compare the observed intervals and the one you calculated in part b to the rule of thumb that the Celsius temperature is 54 minus twice the interval between flashes.
The first-order rate constant for the decomposition of a certain hormone in water at 25C is 3.42104day1. (a) If a 0.0200 M solution of the hormone is stored at 25C for two months, what will its concentration be at the end of that period? (b) How long will it take for the concentration of the solution to drop from 0.0200 M to 0.00350 M? (c) What is the half-life of the hormone?
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?
If the activation energy of a reaction is 9.13 kJ, then what is the percent increase in the rate constant when the temperature is increased from 27C to 69C?
The decomposition of NH3 to N2 and H2 was studied on two surfaces: Surface Ea (kJ/mol) W 163 Os 197 Without a catalyst, the activation energy is 335 kJ/mol. a. Which surface is the better heterogeneous catalyst for the decomposition of NH3? Why? b. How many times faster is the reaction at 298 K on the W surface compared with the reaction with no catalyst present? Assume that the frequency factor A is the same for each reaction. c. The decomposition reaction on the two surfaces obeys a rate law of the form Rate=k[NH3][H2] How can you explain the inverse dependence of the rate on the H2 concentration?