The following reaction is taking place at $T=300K$ and $1$ bar.

$(\frac{1}{2})A(\frac{5}{3})B+C$

A corresponds to component $1,B2$ and $C3,D=0\mathrm{.}246\frac{c{m}^2}{(s)},D_{13}=0\mathrm{.}618\frac{c{m}^2}{(s)}$

The gas analysis indicates that $y_1=0\mathrm{.}420,$ and $y_2=0\mathrm{.}177$

Considering that all the components form a stagnant film except component $1,$ the $D1.$eff in $\frac{c{m}^2}{(s)}$ is:

Hit Write the answer in the form: $x.x,$ for example $0\mathrm{.}162$