b$)$ The spent acid from a nitration process is upgraded so it can be reused in the process. In the upgrading process the spent acid is mixed with concentrated nitric acid $($:$HN{O}_3\}$ and concentrated sulfuric acid $(93\%H_{2}S{O}_4).$ The spent acid contains $22\%$ HNO$3,58\%H_{2}S{O}_4$ and the remainder is water. It enters the mixer at a rate of $15k\frac{g}{s}.$ The upgraded acid contains $28\%HN{O}_3$ and $60\%H_{2}S{O}_4.$

i$)$ Draw and label the flow diagram for the above process.

$(4$ marks$)$

ii$)$ Determine the mass flow rates of the concentrated $HN{O}_3$ stream and the concentrated $H_{2}S{O}_4$ stream entering the mixer.

$(8$ marks$)$