First slide
First order reactions
Question

The rate constant k, for the reaction N2O5(g)2NO2(g)+12O2(g) is 2.3×102s1. Which equation given below describes the change of [N2O5] with time? [N2O5]0 and [N2O5]t correspond to concentration of N2O5 initially and at time, t?

Moderate
Solution

Rate constant=2.3×102sec1

It means it is a first order reaction (because unit of rate constant is sec-1)

For first order reaction k=1tlnaax

kt=lnaax=ln[N2O5]0[N2O5]t

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