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Assigned problems _4

Assigned problems _4 - 5.535x10-7 sec-1 At 76.0 °C the...

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Chemistry 2080 Spring 2011 Problem Set #4 - due date: Friday February 25th at 2 pm Name:________________ Lab TA Name:__________________ Lab Day/Time:______________________ 1) When heated at 110°C, compound A reacts to give compound B. Listed below are values of the concentration of A remaining at various times after the start of the reaction. TIME (sec) [A] (molar) 0 0.126 400 0.0937 800 0.0697 1200 0.0518 1600 0.0385 2000 0.0286 (a) Use a graphical method (i.e. plot the data) to determine the order of this reaction. (Please attach plots). (b) Calculate the value of the rate constant (c) Calculate the time (after t=0) when the concentration of A will be reduced to ONE THIRD of its original value.

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2) At 50.0 °C compound D is converted to compound E in a first-order process with a rate constant equal to
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Unformatted text preview: 5.535x10-7 sec-1 . At 76.0 °C the rate constant has increased to 7.433x10-6 sec-1 . (a) Assuming that the dependence on temperature of the rate of this reaction can be described by the Arrhenius Equation, calculate the values of the pre-exponential factor (“A”), and the energy of activation (Ea) for this reaction. (b) Calculate the temperature at which the rate of this reaction would be the average (numeric mean) of the rates at 50.0 °C and 76.0 °C. (c) Calculate what the rate constant would be at a temperature that is the average (numeric mean) of 50.0 °C and 76.0 °C....
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Assigned problems _4 - 5.535x10-7 sec-1 At 76.0 °C the...

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