\(Đặt:n_{MgO}=a\left(mol\right);n_{ZnO}=b\left(mol\right)\left(a,b>0\right)\\ n_{H_2SO_4}=0,2.1,5=0,3\left(mol\right)\\a, PTHH:MgO+H_2SO_4\rightarrow MgSO_4+H_2O\\ ZnO+H_2SO_4\rightarrow ZnSO_4+H_2O\\ \Rightarrow\left\{{}\begin{matrix}a+b=0,3\\40a+81b=20,2\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}a=0,1\\b=0,2\end{matrix}\right.\\ b,m_{MgO}=40a=4\left(g\right);m_{ZnO}=81b=16,2\left(g\right)\)
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