\(a.CuO+2HCl\rightarrow CuCl_2+H_2O\\ ZnO+2HCl\rightarrow ZnCl_2+H_2\\ n_{HCl}=0,4.3=1,2mol\\ n_{CuCl_2}=a;n_{ZnCl_2}=b\\ \Rightarrow\left\{{}\begin{matrix}80a+81b=48,5\\2a+2b=1,2\end{matrix}\right.\\ \Rightarrow a=0,1,b=0,5\\ m_O=16\left(0,1+0,5\right)=9,6g\\ c.m_{CuCl_2}=0,1.135=13,5g\\ m_{ZnCl_2}=0,5.136=68g\\ d.C_{M_{CuCl_2}}=\dfrac{0,1}{0,4}=0,25M\\ C_{M_{ZnCl_2}}=\dfrac{0,5}{0,4}=1,25M\)
a, \(CuO+2HCl\rightarrow CuCl_2+H_2O\)
\(ZnO+2HCl\rightarrow ZnCl_2+H_2O\)
b, \(n_{HCl}=0,4.3=1,2\left(mol\right)\)
→ \(O+2H\rightarrow H_2O\)
⇒ nO = 0,6 (mol)
⇒ mO = 0,6.16 = 9,6 (g)
c, Theo PT: \(n_{H_2O}=\dfrac{1}{2}n_{HCl}=0,6\left(mol\right)\)
Theo ĐLBT KL, có: m oxit + mHCl = m muối + mH2O
⇒ 48,5 + 1,2.36,5 = m muối + 0,6.18
⇒ m muối = 81,5 (g)
d, Ta có: 135nCuCl2 + 136nZnCl2 = 81,5 (1)
Theo PT: \(\left\{{}\begin{matrix}n_{CuO}=n_{CuCl_2}\\n_{ZnO}=n_{ZnCl_2}\end{matrix}\right.\) ⇒ 80nCuCl2 + 81nZnCl2 = 48,5 (2)
Từ (1) và (2) \(\Rightarrow\left\{{}\begin{matrix}n_{CuCl_2}=0,1\left(mol\right)\\n_{ZnCl_2}=0,5\left(mol\right)\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}C_{M_{CuCl_2}}=\dfrac{0,1}{0,4}=0,25\left(M\right)\\C_{M_{ZnCl_2}}=\dfrac{0,5}{0,4}=1,25\left(M\right)\end{matrix}\right.\)
