$2C_2H_5OH+2Na\rightarrow 2C_2H_5ONa+H_2\uparrow$ $x 0,5x$
$2C_6H_5OH+2Na\rightarrow 2C_6H_5ONa+H_2\uparrow$
$y 0,5y$
$C_6H_5OH+NaOH\rightarrow C_6H_5ONa+H_2O$
$y y$
$\Rightarrow \begin{cases}0,5(x+y)=0,3 mol \\ y=0,4 mol \end{cases}\Rightarrow \begin{cases}x=0,2 mol \\ y=0,4 mol \end{cases}$
$a)\Rightarrow a=0,2.46+0,4.94=46,8 gam$
$b)C_6H_5OH+3Br_2\rightarrow C_6H_2Br_3OH\downarrow+3HBr$
$0,5y 0,5y$
$\Rightarrow m=0,5.0,4.331=66,2 gam$