$1\mathrm{.}2\mathrm{.}1.$ Perform the degree of freedom $($DOF$)$ analysis and de duce if the material balance can be solved.$(5$ marks$)$

$1\mathrm{.}2\mathrm{.}2.$ Solve the material balance if $m_3^{}$ is half of the flow rate of $m_1^{}$ and $90\%$ of $C$ in $m_1^{}$ exists in marks