đề có sai chỗ nào ko vậy
mik thấy thay Zn bằng Cu hợp lí hơn
$Zn + 2HCl \to ZnCl_2 + H_2$
Theo PTHH :
$n_{H_2} = n_{Zn} = \dfrac{12,8}{65} = 0,197(mol)$
$2H_2 + O_2 \xrightarrow{t^o} 2H_2O$
Theo PTHH :
$n_{H_2O} = n_{H_2} = 0,197(mol)$
$m_{H_2O} = 0,197.18 = 3,546(gam)$
\(n_{Zn}=\dfrac{12,8}{65}=\dfrac{64}{325}\left(mol\right)\\ Zn+2HCl\rightarrow ZnCl_2+H_2\\ H_2+\dfrac{1}{2}O_2\underrightarrow{^{to}}H_2O\\ n_{H_2O}=n_{ZnCl_2}=n_{H_2}=n_{Zn}=\dfrac{64}{325}\left(mol\right)\\ m_{H_2O}=\dfrac{64}{325}.18\approx3,545\left(g\right)\\ m_{ZnCl_2}=\dfrac{64}{325}.136\approx26,782\left(g\right)\)