\( t_{1/2}= \frac{{{{[R]}_0}}}{{2K}}\)
\(\therefore \,K = \) \(\frac{{{{[R]}_0}}}{{2 t_{1/2}}}\)\( = \frac{2}{{2 \times 1}} = 1\) મોલર કલાક \(^{-1}\)
\(\therefore \,\,{\text{t}} = \frac{{{{{\text{[R]}}}_{\text{0}}} - {{[R]}_t}}}{K}\,\,\,\)
\(\,\therefore \,\,\,t = \frac{{0.5 - 0.25}}{1} = 0.25\) કલાક