A product P forms in solution. Its concentration was measured at intervals of 50 s…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A product P forms in solution. Its concentration was measured at intervals of . It was at , at , at , at and at . Find the average rate of formation of P in the first , in the last and over the whole .
Need a reminder? The key ideaShow
The rate of a reaction is or , in . For , divide each rate by its coefficient to get the rate of the reaction. The rate at one moment is the slope of the tangent.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. The first interval. .
Step 2. The last interval. .
Step 3. The whole run. .
Check. The whole run average lies between the first and the last interval. The rate falls as the reaction goes on, so this is what we expect.
Answer: , and .
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