a) $2Al + 3H_2SO_4 \to Al_2(SO_4)_3 + 3H_2$
b)
$n_{H_2SO_4} = \dfrac{200.15\%}{98} = \dfrac{15}{49}(mol)$
Theo PTHH :
$n_{H_2} = n_{H_2SO_4} = \dfrac{15}{49}(mol)$
$n_{Al_2(SO_4)_3} = \dfrac{1}{3}n_{H_2SO_4} = \dfrac{5}{49}(mol)$
Vậy :
$V_{H_2} = \dfrac{15}{49}.22,4 = 6,86(lít)$
$m_{Al_2(SO_4)_3} = \dfrac{5}{49}.342 = 34,9(gam)$
\(n_{H_2SO_4}=\dfrac{200\cdot15\%}{98}=\dfrac{15}{49}\left(mol\right)\)
\(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\)
\(........\dfrac{15}{49}.........\dfrac{5}{49}......\dfrac{15}{49}\)
\(m_{Al_2\left(SO_4\right)_3}=\dfrac{5}{49}\cdot342=35\left(g\right)\)
\(V_{H_2}=\dfrac{15}{49}\cdot22.4=6.85\left(l\right)\)
a, \(PTHH:3H_2SO_4+2Al\rightarrow Al_2\left(SO_4\right)_3+3H_2\)
b, Ta có : \(n_{H2SO4}=\dfrac{m}{M}=\dfrac{15}{49}\left(mol\right)\)
Theo PTHH : \(n_{Al2\left(SO4\right)3}=\dfrac{1}{3}n_{H2SO4}=\dfrac{5}{49}\left(mol\right)\)
\(\Rightarrow m_{Al2\left(SO4\right)3}=n.M\approx34,9g\)
Theo PTHH : \(n_{H2}=n_{H2SO4}=\dfrac{15}{49}\left(mol\right)\)
\(\Rightarrow V=6,85\left(l\right)\)
mdd H2SO4=200.15%=30(g)
-->nH2SO4=30/98=0,3(mol)
PTHH: 2Al+3H2SO4-->Al2(SO4)3+3H2(1)
0,3 0,15 0,45 (mol)
từ pt (1)-->+)nAl2(SO4)3=0,15(mol)-->mAl2(SO4)3=0,15.342=51,3(g)
+)nH2=0,45(mol)-->VH2(đktc)=0,45.22,4=10,08(l)
bạn tham khảo và nếu thấy đúng thì tích nhé!