Câu1:
\(m_{CaCO_3}=\dfrac{50.85}{100}=42,5\left(g\right)\)
\(\Rightarrow n_{CaCO_3}=0,425\left(mol\right)\)
\(CaCO_3\left(0,425\right)+2HCl\rightarrow CaCl_2+CO_2\left(0,425\right)+H_2O\)
Theo PTHH: nCO2 = 0,425 (mol)
=> \(V_{CO_2}\left(đktc\right)=9,52\left(l\right)\)
Câu 2
\(m_{HCl}\left(bđ\right)=24\left(g\right)\)
\(\Rightarrow m_{HCl}\left(sau\right)=20+24=44\left(g\right)\)
\(m_{ddHCl}\left(sau\right)=20+480=500\left(g\right)\)
\(\Rightarrow C\%_{HCl}\left(sau\right)=\dfrac{44}{500}.100=8,8\%\)