1.\(n_{H_2}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\)
PTHH: 2Al + 3H2SO4 → Al2(SO4)3 + 3H2
Mol: 0,2 0,3 0,3
2. \(m_{Al}=0,2.27=5,4\left(g\right)\)
\(m_{MgO}=17,4-5,4=12\left(g\right)\)
3. \(n_{MgO}=\dfrac{12}{40}=0,3\left(mol\right)\)
PTHH: MgO + H2SO4 → MgSO4 + H2O
Mol: 0,3 0,3
\(n_{H_2SO_4}=0,3+0,3=0,6\left(mol\right)\)
\(V_{ddH_2SO_4}=\dfrac{0,6}{1}=0,6\left(l\right)=600\left(ml\right)\)
Câu 4 :
\(n_{H2}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\)
1) Pt : \(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2|\)
2 3 1 3
0,2 0,3 0,3
\(MgO+2H_2SO_4\rightarrow MgSO_4+H_2O|\)
1 1 1 1
0,3 0,3
2) \(n_{Al}=\dfrac{0,3.2}{3}=0,2\left(mol\right)\)
\(m_{Al}=0,2.27=5,4\left(g\right)\)
\(m_{MgO}=17,4-5,4=12\left(g\right)\)
3) Có : \(m_{MgO}=12\left(g\right)\)
\(n_{MgO}=\dfrac{12}{40}=0,3\left(mol\right)\)
\(n_{H2SO4\left(tổng\right)}=0,3+0,3=0,6\left(mol\right)\)
\(V_{ddH2SO4}=\dfrac{0,6}{1}=0,6\left(l\right)\)
= 600(ml)
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