\(Na_2CO_3+2HCl\rightarrow2NaCl+CO_2+H_2O\\ K_2CO_3+2HCl\rightarrow2KCl+CO_2+H_2O\\ BaCO_3+2HCl\rightarrow BaCl_2+CO_2+H_2O\\ ZnCO_3+2HCl\rightarrow ZnCl_2+CO_2+H_2O\\ n_{CO_2}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\\ n_{muối.khan}=43,45+0,3.\left(71-60\right)=46,75\left(g\right)\)
Ta có: \(n_{CO_2}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\) \(\Rightarrow m_{CO_2}=0,3\cdot44=13,2\left(g\right)\)
Bảo toàn nguyên tố: \(n_{CO_2}=n_{H_2O}=\dfrac{1}{2}HCl=0,3\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}m_{H_2O}=0,3\cdot18=5,4\left(g\right)\\m_{HCl}=0,3\cdot2\cdot36,5=21,9\left(g\right)\end{matrix}\right.\)
Bảo toàn khối lượng: \(m_{muối}=m_{hh\left(ban.đầu\right)}+m_{HCl}-m_{H_2O}-m_{CO_2}=46,75\left(g\right)\)
\(n_{CO_2}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\Rightarrow m_{CO_2}=0,3.22,4=13,2\left(g\right)\)
PTHH: Na2CO3 + 2HCl → 2NaCl + CO2 + H2O
PTHH: K2CO3 + 2HCl → 2KCl + CO2 + H2O
PTHH: BaCO3 + 2HCl → BaCl2 + CO2 + H2O
PTHH: ZnCO3 + 2HCl → ZnCl2 + CO2 + H2O
Ta có: \(n_{HCl}=8n_{CO_2}=8.0,3=2,4\left(mol\right)\Rightarrow m_{HCl}=2,4.36,5=87,6\left(g\right)\)
\(n_{H_2O}=n_{CO_2}=0,3\left(mol\right)\Rightarrow m_{H_2O}=5,4\left(g\right)\)
Theo ĐLBTKL ta có:
\(m_{hh}+m_{HCl}=m_{muôi}+m_{CO_2}+m_{H_2O}\)
\(\Leftrightarrow m_{muối}=43,45+87,6-13,2-5,4=112,45\left(g\right)\)