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PTHH: \(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\uparrow\)
Ta có: \(n_{Al}=\dfrac{5,4}{27}=0,2\left(mol\right)\) \(\Rightarrow n_{H_2SO_4}=n_{H_2}=0,3\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}m_{H_2SO_4}=0,3\cdot98=29,4\left(g\right)\\V_{H_2}=0,3\cdot22,4=6,72\left(l\right)\end{matrix}\right.\)
\(n_{Al}=\dfrac{2,7}{27}=0,1mol\)
\(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\)
0,1 0,15 0,15 ( mol )
\(V_{H_2}=0,15.22,4=3,36l\)
\(m_{H_2SO_4}=0,15.98=14,7g\)
bạn ghi rõ cách tính số mol của H2SO4 với Al2(SO4)3 + 3H2 được không ạ
Gọi x, y lần lượt là số mol Al, Fe
\(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\\ Fe+H_2SO_4\rightarrow FeSO_4+H_2\\ n_{H_2}=\dfrac{0,56}{22,4}=0,025\left(mol\right)\\ Tacó:\left\{{}\begin{matrix}27x+56y=0,83\\1,5x+y=0,025\end{matrix}\right.\\ \Rightarrow\left\{{}\begin{matrix}x=0,01\\y=0,01\end{matrix}\right.\\ \Rightarrow\left\{{}\begin{matrix}m_{Al}=0,27\left(g\right)\\m_{Fe}=0,56\left(g\right)\end{matrix}\right.\)
\(n_{Al}=\dfrac{5,4}{27}=0,2mol\)
\(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\)
0,2 0,1 0,3 ( mol )
\(m_{Al_2\left(SO_4\right)_3}=0,1.342=34,2g\)
\(V_{H_2}=0,3.22,4=6,72l\)
2Al + 3H2SO4 -> Al2(SO4)3 + 3H2
nAl=\(\dfrac{10,8}{27}=0,4\left(mol\right)\)
Theo PTHH ta có:
\(\dfrac{3}{2}\)nAl=nH2SO4=nH2=0,6(mol)
\(\dfrac{1}{2}\)nAl=nAl2(SO4)3=0,2(mol)
mH2SO4=98.0,6=58,8(g)
VH2=0,6.22,4=13,44(lít)
C1:mAl2(SO4)3=0,2.342=68,4(g)
C2:
Áp dụng định luật BTKL ta có:
mAl+mH2SO4=mAl2(SO4)3+mH2
=>mAl2(SO4)3=mAl+mH2SO4-mH2
=10,8+58,8-0,6.2=68,4(g)
PTHH: \(2Al\left(OH\right)_3+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+6H_2O\)
Ta có: \(n_{Al\left(OH\right)_3}=\dfrac{7,8}{78}=0,1\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}n_{H_2SO_4}=0,15mol\\n_{Al_2\left(SO_4\right)_3}=0,05mol\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}m_{H_2SO_4}=0,15\cdot98=14,7\left(g\right)\\m_{Al_2\left(SO_4\right)_3}=0,05\cdot342=17,1\left(g\right)\end{matrix}\right.\)
\(n_{Al}=\dfrac{5.4}{27}=0.2\left(mol\right)\\ n_{H_2SO_4}=\dfrac{49}{98}=0.5\left(mol\right)\)
\(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\)
\(Bđ:0.2..........0.5\)
\(Pư:0.2.........0.3..............0.1............0.3\)
\(Kt:0...........0.2...............0.1.............0.3\)
\(m_{Al_2\left(SO_4\right)_3}=0.1\cdot342=34.2\left(g\right)\)
\(V_{H_2}0.3\cdot22.4=6.72\left(l\right)\)
\(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\)
\(n_{H_2}=\dfrac{33,44}{22,4}=1,5mol\)
\(\Rightarrow n_{Al}=\dfrac{1,5}{3}.2=1mol\) \(\Rightarrow m_{Al}=1.27=27g\)
\(n_{H_2SO_4}=n_{H_2}=1,5mol\) \(\Rightarrow m_{H_2SO_4}=1,5.98=147g\)
\(n_{Al_2\left(SO_4\right)_3}=\dfrac{1,5}{3}=0,5mol\) \(\Rightarrow m_{Al_2\left(SO_4\right)_3}=0,5.342=171g\)