a) 2Al + 3H2SO4 → Al2(SO4)3 + 3H2
\(n_{Al_2\left(SO_4\right)_3}=\dfrac{34,2}{342}=0,1\left(mol\right)\)
b) Theo PT: \(n_{Al}=2n_{Al_2\left(SO_4\right)_3}=2\times0,1=0,2\left(mol\right)\)
\(\Rightarrow m_{Al}=0,2\times27=5,4\left(g\right)\)
Theo PT: \(n_{H_2}=3n_{Al_2\left(SO_4\right)_3}=3\times0,1=0,3\left(mol\right)\)
\(\Rightarrow V_{H_2}=0,3\times22,4=6,72\left(l\right)\)
\(n_{Al_2\left(SO_4\right)_3}=\dfrac{m}{M}=\dfrac{34,2}{342}=0,1\left(mol\right)\)
A. PTHH: \(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\)
Theo PT: 2 _______________1__________3
Theo đề: _0,2_______________0,1_________0,3
\(\Rightarrow n_{Al}=\dfrac{0,1.2}{1}=0,2\left(mol\right)\)
-Khối lượng nhôm phản ứng là:
\(m_{Al}=n.M=0,2.27=5,4\left(g\right)\)
Từ PT \(\Rightarrow n_{H_2}=\dfrac{0,1.3}{1}=0,3\left(mol\right)\)
\(\Rightarrow V_{H_2}=n.22,4=0,3.22,4=6,72\left(l\right)\)