$t _{10 s }=\frac{2.303}{ K }(\log 10-\log 9)$

$t _{10 s }=\frac{2.093}{ K } \times(0.04)$

Similarly,

$t _{90 \% 6}=\frac{1}{ K } \ln \left(\frac{100}{10}\right)$

$t _{90 s }=\frac{2.303}{ K }$

$\frac{t_{9 rP _6}}{t_{10 \%}}=\frac{1}{0.04}=25$

$e^k=\frac{a}{a-x}$

$\frac{a-x}{a}=e^{-k t}$3

$1-\frac{x}{a}=e^{-k t}$

$x=a\left(1-e^{-l a t}\right)$

$\alpha=\frac{x}{a}=\left(1-e^{-b}\right)$