a, PT: \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
Ta có: \(m_{HCl}=200.7,3\%=14,6\left(g\right)\Rightarrow n_{HCl}=\dfrac{14,6}{36,5}=0,4\left(mol\right)\)
Theo PT: \(n_{Zn}=n_{ZnCl_2}=n_{H_2}=\dfrac{1}{2}n_{HCl}=0,2\left(mol\right)\)
\(\Rightarrow m_{Zn}=0,2.65=13\left(g\right)=m_1\)
\(m_{ZnCl_2}=0,2.136=27,2\left(g\right)=m_2\)
\(V_{H_2}=0,2.22,4=4,48\left(l\right)=V\)
b, Ta có: m dd sau pư = 13 + 200 - 0,2.2 = 212,6 (g)
\(\Rightarrow C\%_{ZnCl_2}=\dfrac{27,2}{212,6}.100\%\approx12,8\%\)
\(n_{HCl}=\dfrac{200.7,3\%}{36,5}=0,4\left(mol\right)\)
PTHH :
\(Zn+2HCl\rightarrow ZnCl_2+H_2\uparrow\)
0,2 0,4 0,2 0,2
\(a,m_1=0,2.65=13\left(g\right)\)
\(m_2=0,2.136=27,2\left(g\right)\)
\(V_{H_2}=0,2.22,4=4,48\left(l\right)\)
\(b,m_{ddZnCl_2}=13+200-\left(0,2.2\right)=212,6\left(g\right)\)
\(C\%_{ZnCl_2}=\dfrac{27,2}{212,6}.100\%\approx12,79\%\)