Đáp án đúng: B
4,48 (l).
$\begin{array}{l}{{\text{n}}_{\text{CaC}{{\text{O}}_{\text{3}}}\,\text{(1)}}}\,\text{=}\,\text{0}\text{,1}\,\text{mol}\\\text{Ca(HC}{{\text{O}}_{\text{3}}}{{\text{)}}_{\text{2}}}\,\xrightarrow{{{\text{t}}^{\text{o}}}}\,\text{CaC}{{\text{O}}_{\text{3}}}\,\text{+}\,\text{C}{{\text{O}}_{\text{2}}}\,\text{+}\,{{\text{H}}_{\text{2}}}\text{O}\\\,\,\,\,\text{0}\text{,05}\,\,\,\,\,\,\,\,\,\xleftarrow{{}}\,\,\,\,\,\,\,\,\text{0}\text{,05}\\\Rightarrow \,{{\text{n}}_{\text{C}{{\text{O}}_{\text{2}}}}}\,\text{=}\,{{\text{n}}_{\text{CaC}{{\text{O}}_{\text{3}}}\,\text{(1)}}}\,\text{+}\,\text{2}{{\text{n}}_{\text{Ca(HC}{{\text{O}}_{\text{3}}}{{\text{)}}_{\text{2}}}}}\,\text{=}\,\text{0}\text{,2}\,\text{mol}\\\Rightarrow \,{{\text{V}}_{\text{C}{{\text{O}}_{\text{2}}}}}\,\text{=}\,4,48\,\text{lit}\,\end{array}$
