kinetics summary

Question

C composes to form D. The following results were obtained by experiment.

[C] in mol L^-1 1.00x10^-3 2.00x10^-3 6.00x10^-3

Rate in mol L^-1 1.45x10^-5 1.45x10^-5 1.45x10^-5

What is the rate equation and the overall order of the reaction?

Answer 1

If you mean C decomposes to form D, then we can write...

C ===> D

Looking at the data of increasing the [C] from 1.00x10^-3 to 2.00x10^-3 to 6.00x10^-3, we see the rate does NOT change at all. It remains at 1.45x10^-5 mol L^-1s^-1(note: you need a time in the rate, so I used s for seconds).

Since the rate did NOT change, this tells us the reaction is ZERO order with respect to [C] and so the rate equation is

Rate = k[C]⁰ = k , or...

Rate = k

The overall order of the reaction is ZERO