2CLabManual201303

Because the rate constant can be readily calculated

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Unformatted text preview: actions, this time (denoted t1/2), is expressed as follows: Co for n 0, 2k ln 2 for n 1, k t1 / 2 t1 / 2 t1 / 2 1 Co k for n 2. In general, the half-life is proportional to (C0)1-n. We will use these relations to determine the order of the reaction in Part I. Because the rate constant can be readily calculated from t1/2 as shown above (they are inversely proportional), a determination of t1/2 will yield the rate constant. Question A: What would you expect for the ratio of the half-lives, t1/2 (0.05 M) / t1/2 (0.01 M), if the reaction were (a) zero order, (b) first order, or (c) second order? The last part of the assignment is the determination of the activation energy of the reaction. The rate constant for a reaction is related to the energy of activation, Ea, by the Arrhenius equation: k = Ae-Ea/RT where A is a constant characteristic of the reaction, R is the gas constant, and T is the absolute temperature in Kelvin. By taking the logarithm of both sides, we obtain: ln k Ea 1 ln A R T Thus, if you determine the rate constant f...
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This note was uploaded on 04/09/2013 for the course CHE CHE 2C taught by Professor Nasiri during the Spring '07 term at UC Davis.

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