Zn + H2SO4 → ZnSO4 + H2 (1)
CuO + H2SO4 → CuSO4 + H2O (2)
\(n_{H_2}=\frac{4,48}{22,4}=0,2\left(mol\right)\)
a) Theo PT1: \(n_{Zn}=n_{H_2}=0,2\left(mol\right)\)
\(\Rightarrow m_{Zn}=0,2\times65=13\left(g\right)\)
\(\Rightarrow m_{CuO}=21-13=8\left(g\right)\)
\(\%m_{Zn}=\frac{13}{21}\times100\%=61,9\%\)
\(\%m_{CuO}=100\%-61,9\%=38,1\%\)
b) Theo pT1: \(n_{H_2SO_4}=n_{Zn}=0,2\left(mol\right)\)
\(n_{CuO}=\frac{8}{80}=0,1\left(mol\right)\)
Theo pT2: \(n_{H_2SO_4}=n_{CuO}=0,1\left(mol\right)\)
\(\Rightarrow\Sigma n_{H_2SO_4}=0,2+0,1=0,3\left(mol\right)\)
\(\Rightarrow\Sigma m_{H_2SO_4}=0,3\times98=29,4\left(g\right)\)
\(\Rightarrow m_{ddH_2SO_4}=\frac{29,4}{10\%}=294\left(g\right)\)
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