a) Zn + 2HCl --> ZnCl2 + H2
b) \(n_{H_2}=\dfrac{22,4}{22,4}=1\left(mol\right)=>m_{H_2}=1.2=2\left(g\right)\)
Theo ĐLBTKL:
\(m_{Zn}+m_{HCl}=m_{ZnCl_2}+m_{H_2}\)
=> \(m_{HCl}=136+2-65=73\left(g\right)\)
\(a,PTHH:Zn+2HCl\to ZnCl_2+H_2\\ b,m_{H_2}=\dfrac{22,4}{22,4}.2=2(g)\\ BTKL:m_{Zn}+m_{HCl}=m_{ZnCl_2}+m_{H_2}\\ \Rightarrow m_{HCl}=136+2-65=73(g)\)