It means it is a first order reaction (because unit of rate constant is $\sec^{-1}$)
For first order reaction $K = \frac{1}{t}\ln \frac{a}{{a - x}}$
$Kt = \ln \frac{a}{{a - x}} = \ln \frac{{{{[{N_2}{O_5}]}_0}}}{{{{[{N_2}{O_5}]}_t}}}$
(આપેલ : $\log 2=0.30, \log 3=0.48$ )
$N_{2(g)} + 3H_{2(g)} \rightarrow 2NH_{3(g)}$ તો $\frac{d[NH_3]}{dt}$ અને $\frac{d[H_2]}{dt}$ વચ્ચેનો સમાનતાનો સંબંધ ............ થશે.