a: \(ZnO+2HCl\rightarrow ZnCl_2+H_2O\)
b: \(n_{ZnO}=\dfrac{8.1}{81}=0.1\left(mol\right)\)
=>\(n_{ZnCl_2}=0.1\left(mol\right)\)
\(m_{ZnCl_2}=0.1\cdot\left(65+35.5\cdot2\right)=13.2\left(g\right)\)
c: nZnO=0,1(mol)
=>nHCl=0,2(mol)
\(C_{M\left(HCl\right)}=\dfrac{0.2}{0.2}=1\)