Câu hỏi 13

\(\eqalign{ & P1:\left\{ \matrix{ Al\,du \hfill \cr A{l_2}{O_3} \hfill \cr Fe \hfill \cr} \right. \to \left\{ \matrix{ {n_{Al\,du}} = {2 \over 3}{n_{{H_2}}} = 0,1 \hfill \cr Fe:0,45 = > {n_{A{l_2}{O_3}}} = 0,45.{4 \over 9} = 0,2 \hfill \cr} \right. \to \left\{ \matrix{ {{{n_{Al\,du}}} \over {{n_{Fe}}}} = {{0,1} \over {0,45}} = {2 \over 9} \hfill \cr {m_{(1)}} = 48,3g \hfill \cr} \right. \cr & P2:\left\{ \matrix{ \buildrel {BT\,e} \over \longrightarrow 2{n_{{H_2}}} = 3{n_{Al\,du}} + 2{n_{Fe}} = 2,4 \hfill \cr {{{n_{Al\,du}}} \over {{n_{Fe}}}} = {2 \over 9} \hfill \cr} \right. \to \left\{ \matrix{ Al\,du:0,2 \hfill \cr Fe:0,9 \hfill \cr A{l_2}{O_3}:0,9.{4 \over 9} = 0,4 \hfill \cr} \right. \cr & = > {m_{(2)}} = 96,6g \cr & = > m = 144,9g \cr} \)

Đáp án B