In a study of the gas phase decomposition of hydrogen iodide at 700 K HI(g% H2(g) + % L(g) the following data were obtained: HIJ, M 1.19 0.595 0.298 0.149 seconds 932 2.79x103 6.51x103 Hint: It is not necessary to graph these data. (1) The observed half life for this reaction when the starting concentration is 1.19 M is ]s and when the starting concentration is 0.595 M is (2) The average A(1/[HI]) / At from t= 0sto t= 932 s is The average A(1/[HI]) / At from t= 932 s to t = 2.79×103 s is (3) Based on these data, the rate constant for this | order reaction is

In a study of the gas phase decomposition of hydrogen iodide at 700 K HI(g% H2(g) + % L(g) the following data were obtained: HIJ, M 1.19 0.595 0.298 0.149 seconds 932 2.79x103 6.51x103 Hint: It is not necessary to graph these data. (1) The observed half life for this reaction when the starting concentration is 1.19 M is ]s and when the starting concentration is 0.595 M is (2) The average A(1/[HI]) / At from t= 0sto t= 932 s is The average A(1/[HI]) / At from t= 932 s to t = 2.79×103 s is (3) Based on these data, the rate constant for this | order reaction is

Principles of Modern Chemistry

8th Edition

ISBN:9781305079113

Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Chapter18: Chemical Kinetics

Section: Chapter Questions

Problem 7P

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Define stability from both a kinetic and thermodynamic perspective. Give examples to show the differences in these concepts.
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Some bacteria are resistant to the antibiotic penicillin because they produce penicillinase, an enzyme with a molecular weight of 3104 g/mol that converts penicillin into inactive molecules. Although the kinetics of enzyme-catalyzed reactions can be complex, at low concentrations this reaction can be described by a rate equation that is first order in the catalyst (penicillinase) and that also involves the concentration of penicillin. From the following data: 1.0 L of a solution containing 0.15 g ( 0.15106 g) of penicillinase, determine the order of the reaction with respect to penicillin and the value of the rate constant. [Penicillin] (M) Rate (mol/L/min) 2.0106 1.01010 3.0106 1.51010 4.0106 2.01010
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The hydrolysis of the sugar sucrose to the sugars glucose and fructose, C12H22O11+H2OC6H12O6+C6H12O6 follows a first-order rate equation for the disappearance of sucrose: Rate =k[C12H22O11] (The products of the reaction, glucose and fructose, have the same molecular formulas but differ in the arrangement of the atoms in their molecules.) (a) In neutral solution, k=2.11011s1 at 27 C and 8.51011s1 at 37 C. Determine the activation energy, the frequency factor, and the rate constant for this equation at 47 C (assuming the kinetics remain consistent with the Arrhenius equation at this temperature). (b) When a solution of sucrose with an initial concentration of 0.150 M reaches equilibrium, the concentration of sucrose is 1.65107M . How long will it take the solution to reach equilibrium at 27 C in the absence of a catalyst? Because the concentration of sucrose at equilibrium is so low, assume that the reaction is irreversible. (c) Why does assuming that the reaction is irreversible simplify the calculation in pan (b)?
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