Question

Calculate the order of reaction from the following data:
$2{NH}_3\to N_2+3H_2$ (reaction)
Pressure (mm Hg) 50 100 200
Half lives (min) 3.52 1.82 0.93

Answer 1

$t_{1/2}\alpha P^{1-n}$

$\frac{3.52}{1.82}={\left[\frac{50}{100}\right]}^{1-n}$

$1-n=-1$

$n=2$

Order of the reaction is '2'.