$n_{CaO} = \dfrac{11,2}{56} = 0,2(mol)$
$n_{HCl} = 0,5.1 = 0,5(mol)$
$CaO + dư2HCl \to CaCl_2 + H_2O$
Ta thấy :
$n_{CaO} : 1 < n_{HCl} : 2$ nên $HCl$ dư
$n_{HCl\ pư} = 2n_{CaO} = 0,4(mol)$
$m_{HCl\ dư} = (0,5 - 0,4).36,5 = 3,65(gam)$
$n_{CaCl_2} = n_{CaO} = 0,2(mol)$
$C_{M_{HCl\ dư}} = \dfrac{0,1}{0,5} = 0,2M$
$C_{M_{CaCl_2}} = \dfrac{0,2}{0,5} = 0,4M$
\(n_{CaO}=\dfrac{11,2}{56}=0,2\left(mol\right)\\ n_{HCl}=0,5.1=0,5\left(mol\right)\\ CaO+2HCl\xrightarrow[]{}CaCl_2+H_2O\\ \Rightarrow\dfrac{0,2}{1}< \dfrac{0,5}{2}\Rightarrow HCl.dư\\ n_{HCl\left(pư\right)}=0,2.2=0,4\left(mol\right)\\ n_{HCl\left(dư\right)}=0,5-0,4=0,1\left(mol\right)\\ m_{HCl\left(dư\right)}=0,1.36,5=3,65\left(g\right)\\ n_{CaCl_2}=n_{CaO}=0,2mol\\ C_{M_{CaCl_2}}=\dfrac{0,2}{0,5}=0,4\left(M\right)\\ C_{M_{HCl}}=\dfrac{0,1}{0,5}=0,2\left(M\right)\)