Ta có: \(n_{Al}=\dfrac{5,4}{27}=0,2\left(mol\right)\)
Ta lại có: \(C_{\%_{H_2SO_4}}=\dfrac{m_{H_2SO_4}}{294}.100\%=20\%\)
=> \(m_{H_2SO_4}=58,8\left(g\right)\)
=> \(n_{H_2SO_4}=\dfrac{58,8}{98}=0,6\left(mol\right)\)
PTHH: 2Al + 3H2SO4 ---> Al2(SO4)3 + 3H2
Ta thấy: \(\dfrac{0,2}{1}=\dfrac{0,6}{3}\)
Vậy không có chất dư.
Theo PT: \(n_{Al_2\left(SO_4\right)_3}=\dfrac{1}{2}.n_{Al}=\dfrac{1}{2}.0,2=0,1\left(mol\right)\)
=> \(m_{Al_2\left(SO_4\right)_3}=0,1.342=34,2\left(g\right)\)
Ta có: \(m_{dd_{Al_2\left(SO_4\right)_3}}=294+5,4-\left(\dfrac{3}{2}.0,2.2\right)=298,8\left(g\right)\)
=> \(C_{\%_{Al_2\left(SO_4\right)_3}}=\dfrac{34,2}{298,8}.100\%=11,45\%\)
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