Đáp án đúng: C
7,68g
$\displaystyle \begin{array}{l}\text{3}{{\text{H}}_{\text{2}}}\text{S+}{{\text{K}}_{\text{2}}}\text{C}{{\text{r}}_{\text{2}}}{{\text{O}}_{\text{7}}}\text{+4}{{\text{H}}_{\text{2}}}\text{S}{{\text{O}}_{\text{4}}}\xrightarrow{{}}\text{3S+C}{{\text{r}}_{\text{2}}}{{\text{(S}{{\text{O}}_{\text{4}}}\text{)}}_{\text{3}}}\text{+}{{\text{K}}_{\text{2}}}\text{S}{{\text{O}}_{\text{4}}}\text{+7}{{\text{H}}_{\text{2}}}\text{O}\\\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\text{0,08}\,\text{mol}\,\,\,\,\,\,\,\,\,\xrightarrow{{}}\,\,\,\,\,\,\,\,\,\,\,\text{0,24}\\\Rightarrow {{\text{m}}_{\text{S}}}\text{=7,68}\,\text{gam}\end{array}$
