a)
\(n_{Al}=\dfrac{5,4}{27}=0,2\left(mol\right)\)
\(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\)
0,2--->0,3------->0,1------------>0,3
$m_{dd.H_2SO_4}=\frac{0,3.98.100\%}{19,6\%}=150\left(g\right)$
b)
\(V_{H_2}=0,3.22,4=6,72\left(l\right)\)
c)
\(C\%_{Al_2\left(SO_4\right)_3}=\dfrac{0,1.342.100\%}{5,4+150-0,3.2}=22,09\%\)
Ta có: \(n_{Al}=\dfrac{5,4}{27}=0,2\left(mol\right)\)
PT: \(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\)
_____0,2_______0,3________0,1_______0,3 (mol)
a, \(m_{H_2SO_4}=0,3.98=29,4\left(g\right)\Rightarrow m_{ddH_2SO_4}=\dfrac{29,4}{19,6\%}=150\left(g\right)\)
b, \(V_{H_2}=0,3.22,4=6,72\left(l\right)\)
c, Ta có: m dd sau pư = 5,4 + 150 - 0,3.2 = 154,8 (g)
\(\Rightarrow C\%_{Al_2\left(SO_4\right)_3}=\dfrac{0,1.342}{154,8}.100\%\approx22,09\%\)
\(a)n_{Al}=\dfrac{5,4}{27}=0,2mol\\ 2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\\ 0,2.........0,3.................0,1........0,3\\ m_{ddH_2SO_4}=\dfrac{0,3.98}{19,6}\cdot100=150g\\ b)V_{H_2\left(đktc\right)}=0,3.22,4=6,72l\\ c)C_{\%Al_2\left(SO_4\right)_3}=\dfrac{0,1.342}{5,4+150-0,3.2}\cdot100=22,9\%\)
