$($a$)$ calculate BR time to achieve

$x=5\%,x=45\%,x=75\%$

When $100$ moles of $A$ in $400d{m}^3$reactor

reactor. $F_{A_0}=0,4$

$\backslash$table$[[x,0,0\mathrm{.}1,0\mathrm{.}2,0\mathrm{.}4,0\mathrm{.}6,0\mathrm{.}7,0\mathrm{.}8],[-r_A,0,45,0\mathrm{.}37,0\mathrm{.}3,0\mathrm{.}195,0\mathrm{.}113,0\mathrm{.}019,0\mathrm{.}05]]$

$\frac{F_{A_0}}{r_A},0\mathrm{.}88,1\mathrm{.}08,1\mathrm{.}13,2\mathrm{.}65,3,54,5\mathrm{.}06,8$

$t=N_{A*}{\displaystyle \underset{0}{\overset{x}{}}}\frac{dx}{-r_{A}V}$