Which of the following aspect is NOT dealt by chemical kinetics?

For the reaction, 

$2\mathrm{A} +\mathrm{B}\stackrel{}{\to }3\mathrm{C} + \mathrm{D},$

which of the following does NOT express the reaction rate?

The rate of a reaction is expressed in different ways as follows:

$+\frac{1}{2} \frac{\mathrm{d}\left[\mathrm{C}\right]}{\mathrm{dt}}=-\frac{1}{5}\frac{\mathrm{d}\left[\mathrm{D}\right]}{\mathrm{dt}} = +\frac{1}{3} \frac{\mathrm{d}\left[\mathrm{A}\right]}{\mathrm{dt}}=-\frac{\mathrm{d}\left[\mathrm{B}\right]}{\mathrm{dt}}$, the reaction is ______.

In the formation of sulphur trioxide by the contact process,

$2{\mathrm{SO}}_{2 \left(\mathrm{g}\right)} + {\mathrm{O}}_{2 \left(\mathrm{g}\right)}\stackrel{}{\to } 2{\mathrm{SO}}_{3 \left(\mathrm{g}\right)}$

The rate of reaction is expressed as 

$-\frac{\mathrm{d}[{\mathrm{O}}_{\mathrm{2}}\mathrm{]}}{\mathrm{dt}}= 2.5 \times {10}^{–4} \mathrm{mol} {\mathrm{L}}^{-1} {\mathrm{s}}^{-1}$

The rate of disappearance of ${\mathrm{SO}}_2$ will be ____