please help me For a system with $4$ components $-A,B,C,D,$ it is given that $2A+3B1C+5D.$ Determine the system flux $N_A$ as a

function of $x_A,D_{A,\text{m}\text{i}\text{x},}{C}_{\text{t}\text{o}\text{t}\text{a}\text{l}\text{,}},$ for $r-$transport. Determine the system flux $N_B,N_c,N_D$ in similar ways.