\(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\)
\(n_{Al}=\dfrac{2}{3}n_{H_2}=0,2\left(mol\right)\)
=> \(m_{Al}=0,2.27=5,4\left(g\right)\)
=> \(m_{Cu}=11,8-5,4=6,4\left(g\right)\)
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