The irreversible isomerization, $AB,$ was carried out in a constant$-$volume batch reactor and the following concentration$-$time data were obtained:

$\backslash$table$[[C_A,4\mathrm{.}2,2\mathrm{.}45,1\mathrm{.}65,1\mathrm{.}15,0\mathrm{.}72,0\mathrm{.}33,0\mathrm{.}12,0\mathrm{.}009],[t(min),0,5,8,10,12,15,17\mathrm{.}5,20]]$