Đáp án:
\( {V_{{H_2}}} = 6,72{\text{ lít}}\)
\( C{\% _{{H_2}S{O_4}}} = 9,8\% \)
\( C{\% _{A{l_2}{{(S{O_4})}_3}}} = 11,22\% \)
Giải thích các bước giải:
Phản ứng xảy ra:
\(2Al + 3{H_2}S{O_4}\xrightarrow{{}}A{l_2}{(S{O_4})_3} + 3{H_2}\)
Ta có:
\({n_{Al}} = \frac{{5,4}}{{27}} = 0,2{\text{ mol}} \to {{\text{n}}_{{H_2}}} = \frac{3}{2}{n_{Al}} = 0,3{\text{ mol}}\)
\( \to {V_{{H_2}}} = 0,3.22,4 = 6,72{\text{ lít}}\)
\({n_{{H_2}S{O_4}}} = {n_{{H_2}}} = 0,3{\text{ mol}}\)
\( \to {m_{{H_2}S{O_4}}} = 0,3.98 = 29,4{\text{ gam}}\)
\( \to C{\% _{{H_2}S{O_4}}} = \frac{{29,4}}{{300}} = 9,8\% \)
BTKL:
\({m_{Al}} + {m_{dd\;{{\text{H}}_2}S{O_4}}} = {m_{dd}} + {m_{{H_2}}}\)
\( \to 5,4 + 300 = {m_{dd}} + 0,3.2 \to {m_{dd}} = 304,8{\text{ gam}}\)
\({n_{A{l_2}{{(S{O_4})}_3}}} = \frac{1}{2}{n_{Al}} = 0,1{\text{ mol}}\)
\( \to {m_{A{l_2}{{(S{O_4})}_3}}} = 0,1.(27.2 + 96.3) = 34,2{\text{ gam}}\)
\( \to C{\% _{A{l_2}{{(S{O_4})}_3}}} = \frac{{34,2}}{{304,8}} = 11,22\% \)
