a) $Zn + 2HCl \to ZnCl_2 + H_2$
b) $n_{H_2} = n_{Zn} = \dfrac{32,5}{65} = 0,1(mol)$
$V_{H_2} = 0,1.22,4 = 2,24(lít)$
c) Sau phản ứng :
$m_{dd} = m_{Zn} + m_{dd\ HCl} - m_{H_2} = 32,5 + 180 - 0,1.2 = 212,3(gam)$
$C\%_{ZnCl_2} = \dfrac{0,1.136}{212,3}.100\% = 6,4\%$