\(Zn+2HCl\rightarrow ZnCl_2+H_2\uparrow\)
Có
\(n_{Zn}=\dfrac{6,5}{65}=0,1\) (mol)
\(n_{HCl}=\dfrac{36,5}{36,5}=1\) (mol)
Lập tỉ lệ :
\(n_{Zn}=0,1< \dfrac{n_{HCl}}{2}=0,5\)
=> Zn phản ứng hết.
Theo PTHH : \(n_{ZnCl_2}=n_{Zn}=0,1\) (mol)
=> \(m_{ZnCl_2}=0,1.136=13,6\left(g\right)\)
\(n_{Zn}=\dfrac{6,5}{65}=0,1\left(mol\right)\)
\(n_{HCl}=\dfrac{36,5}{36,5}=1\left(mol\right)\)
PTHH: Zn + 2HCl --> ZnCl2 + H2
Có \(\dfrac{n_{Zn}}{1}< \dfrac{n_{HCl}}{2}\) => Zn hết, HCl dư
PTHH: Zn + 2HCl --> ZnCl2 + H2
______0,1--------------->0,1__________(mol)
=> \(m_{ZnCl_2}=0,1.136=13,6\left(g\right)\)
Do đó, ta có:
