Utterly Confused About Rate Law and Half-Life

13-7 Utterly Confused About Rate Law and Half-Life (t1/2) 

In order to work problems of this type it is important to know what the order of the reaction is. This may come directly from the problem, for example, the 

In most problems, it will be to your advantage to find and label as many of the following terms as possible [A]0, [A]t, k, t, and t1/2. You will not need all these terms for all problems. However, the ones you have, or do not have, often direct you towards the solution. 

Let s apply the preceding two paragraphs to an example problem. The first-order decomposition of gaseous dinitrogen pentoxide, N205, to nitrogen dioxide, NO2, and oxygen, 02, has a rate constant of 4.9 X 10 4 s 2 at a certain temperature. Calculate the half-life of this reaction. 

This is a first-order reaction. The following relationships apply to first-order reactions  

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