cho 200g dd H2SO4 14% tác dụng với Al dư Tính khối lượng Muối Al2(SO4)3 thu đc ???
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PTHH: 2Al + 3H2SO4 ---> Al2(SO4)3 + 3H2.
Ta có: \(C_{\%_{H_2SO_4}}=\dfrac{m_{H_2SO_4}}{200}.100\%=14,7\%\)
=> \(m_{H_2SO_4}=29,4\left(g\right)\)
=> \(n_{H_2SO_4}=\dfrac{29,4}{98}=0,3\left(mol\right)\)
Theo PT: \(n_{Al_2\left(SO_4\right)_3}=\dfrac{1}{3}.n_{H_2SO_4}=\dfrac{1}{3}.0,3=0,1\left(mol\right)\)
=> \(m_{Al_2\left(SO_4\right)_3}=0,1.342=34,2\left(g\right)\)
Sửa: \(14,7\%\)
\(n_{H_2SO_4}=\dfrac{200.14,7\%}{100\%.98}=0,3(mol)\\ a,PTHH:2Al+3H_2SO_4\to Al_2(SO_4)_3+3H_2\\ \Rightarrow n_{H_2}=0,3(mol)\\ \Rightarrow V_{H_2}=0,3.22,4=6,72(l)\\ b,n_{Al}=\dfrac{2}{3}n_{H_2SO_4}=0,2(mol)\\ \Rightarrow m_{Al}=0,2.27=5,4(g)\\ c,n_{Al_2(SO_4)_3}=\dfrac{1}{2}n_{Al}=0,1(mol)\\ \Rightarrow C\%_{Al_2(SO_4)_3}=\dfrac{0,1.342}{200+5,4-0,3.2}.100\%=16,7\%\\ c,m_{Al_2(SO_4)_3}=0,1.342=34,2(g)\)
mH2SO4 = 9,8%.200=19,6(g) -> nH2SO4=0,2(mol)
nAl=0,1(mol)
PTHH: 2Al +3 H2SO4 -> Al2(SO4)3 + 3H2
Ta có: 0,1/2 < 0,2/3 => H2SO4 dư, Al hết, tính heo nAl
nAl2(SO4)3=mAl/2=0,1/2=0,05(mol)
mAl2(SO4)3 (LT)= 0,05.342=17,1(g)
Vì: H=75%
=>mAl2(SO4)3 (TT)=75%. 17,1=12,825(g)
Ta có: mH\(_2\)SO\(_4\)= 200 . 14% = 28g
=> nH\(_2\)SO\(_4\)= 28/98 = 0,285 (mol)
PTHH : 3H\(_2\)SO\(_4\) + 2 Al ----> Al\(_2\)(SO\(_4\))\(_3\) + 3H\(_2\)
n H\(_2\)SO\(_4\)= 3nAl\(_2\)(SO\(_4\))\(_3\)
=> nAl\(_2\)(SO\(_4\))\(_3\)= 0,285 : 3 =0,095 (mol)
=> mAl\(_2\)(SO\(_4\))\(_3\)= 0,095 . 342 = 32,49 g
PTHH: \(2Al\left(OH\right)_3+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+6H_2O\)
Ta có: \(n_{Al\left(OH\right)_3}=\dfrac{7,8}{78}=0,1\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}n_{H_2SO_4}=0,15mol\\n_{Al_2\left(SO_4\right)_3}=0,05mol\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}m_{H_2SO_4}=0,15\cdot98=14,7\left(g\right)\\m_{Al_2\left(SO_4\right)_3}=0,05\cdot342=17,1\left(g\right)\end{matrix}\right.\)
Ta có : \(m_{H_2SO_4}=14\%.200=28\left(g\right)\)
\(\Rightarrow n_{H_2SO_4}=\frac{28}{98}=\frac{2}{7}\left(mol\right)\)
PTHH : \(2Al+3H_2SO_4=Al_2\left(SO_4\right)_3+3H_2\uparrow\)
(mol) 2/7 2/21
\(\Rightarrow m_{Al_2\left(SO_4\right)_3}=\frac{2}{21}.342=\frac{228}{7}\left(g\right)\)