a) Gọi x, y lần lượt là số mol Al, Fe
2Al + 3H2SO4 → Al2(SO4)3 + 3H2
Fe + H2SO4 → FeSO4+ H2
\(\left\{{}\begin{matrix}27x+56y=5,54\\\dfrac{3}{2}x+y=\dfrac{3,584}{22,4}\end{matrix}\right.\)
=> x=0,06 , y =0,07
=> \(m_{Al}=1,62\left(g\right);m_{Fe}=3,92\left(g\right)\)
b) \(n_{H_2SO_4\left(pứ\right)}=n_{H_2}=0,16\left(mol\right)\)
=> \(m_{H_2SO_4\left(pứ\right)}=0,16.98=15,68\left(g\right)\)
c) \(m_{ddH_2SO_4}=\dfrac{15,68}{20\%}=78,4\left(g\right)\)
c) 2NaOH + H2SO4 → Na2SO4 + 2H2O
\(n_{H_2SO_4\left(dư\right)}=\dfrac{1}{2}n_{NaOH}=\dfrac{1}{2}.0,25.0,6=0,075\left(mol\right)\)
=> \(m_{H_2SO_4\left(bđ\right)}=15,68+0,075.98=23,03\left(g\right)\)
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