As a part of food processing operation, a reaction $(AB+C)$ is carried out in a $20-L$

constant volume batch reactor. Twenty moles of pure A are initially placed in the reactor.

The reactor is well mixed. If the reaction is first order $(k=\frac{0\mathrm{.}865}{m}in),$ estimate the time

necessary to reduce the number of moles of $A$ in the reactor to $0\mathrm{.}2$mol. If the reaction is

of second order $(k=2\frac{L}{m}ol-$min$),$ estimate the time necessary to consume $19$mol of $A.$