\(a)2Al+3H2SO4->Al2(SO4)3+3H2\)
\(Mg+2HCl->MgCl2+H2\)
\(b)n\)\(H2\) \(=\dfrac{5,04}{22,4}=0,225(mol)\)
\(gọi\) \(x\) \(là\) \(n\)\(Al\) \(,y\) \(là\) \(n\)\(Mg\)
\(PTHH\) xảy ra :
\(2Al+3H2SO4->Al2(SO4)3+3H2\)
\(x....................->1,5x\)
\(Mg+2HCl->MgCl2+H2\)
\(y.....................->y\)
lập hệ phương trình :
\(\left\{{}\begin{matrix}27x+24y=4,5\\1,5x+y=0,225\end{matrix}\right.\)
-> \(\left\{{}\begin{matrix}x=0,1mol\\y=0,075mol\end{matrix}\right.\)
%\(m\)Al \(=\dfrac{0,1.27.100}{4,5}=60\) %
%mMg \(=\dfrac{0,075.24.100}{4.5}=40\) %
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