$[$OL $3\mathrm{.}25$ Modified$]$ The gas phase reversible reaction $AR$ was investigated in a constant volume batch reactor at $0C.$ The following data were obtained using a feed of pure $A$ in the gas phase. The reaction started with pure A$.$

$\backslash$table$[[$Time$/$min$,0,2,4,6,8,10,12,14,$