Worksheet 3 on Kinetics. Answer Key 1. Write the rate of the reaction 2O3 → 3O2 in terms of ∆[O3]/∆t. 2.Consider the following stoichiometric reaction: 2A + B → C + D The reaction rates are measured with the following results: Initial rate [A]0 [B]0 1 2 1 2 4 1 1 2 2 What is the order of the reaction with respect to [B]0? Since we’re looking at the order of [B]0, all we have to look at where [B]0 changes and where [A]0 stays the same. You can see that [B]0 doubles from the first row to the third row. However, the rate doesn’t change, therefore the rate order is 0. 3. The first-order rate constant is k = 3.4 x 10-3 sec-1 for the decomposition of cyclobutane and the half-life is 204 seconds. Cyclobutane → 2 (ethylene) What fraction of a sample of cyclobutane remains after 612 seconds under the specified conditions? 4. The reaction A +3B → C +2D has a rate constant k = 1.0 x 10-5 sec-1 at 27° C. If the activation energy for the reaction is 20,000 cal/mol, what is the value of the rate constant at 0°C?5. What is the rate law expression for this reaction? See also: http://neon.cm.utexas.edu/academic/courses/Spring2002/CH302/Laude/answers/e2key.pdf 6. Solution:7.
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