Ta có: \(n_{KOH}=0,2.4=0,8\left(mol\right)\)
PT: \(KOH+HCl\rightarrow KCl+H_2O\)
____0,8_____0,8____0,8 (mol)
a, \(C_{M_{HCl}}=\dfrac{0,8}{1}=0,8\left(M\right)\)
b, \(m_{KCl}=0,8.74,5=59,6\left(g\right)\)
c, PT: \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
_____0,4_____0,8 (mol)
\(\Rightarrow m_{Zn}=0,4.65=26\left(g\right)\)