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Câu 7 :
\(n_{H2}=\dfrac{17,92}{22,4}=0,8\left(mol\right)\)
Pt : \(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2|\)
2 3 1 3
\(\dfrac{8}{15}\) 0,8 \(\dfrac{4}{15}\) 0,8
\(n_{H2SO4}=\dfrac{0,8.3}{3}=0,8\left(mol\right)\)
⇒ \(m_{H2SO4}=0,8.98=78,4\left(g\right)\)
\(n_{Al2\left(SO4\right)3}=\dfrac{0,8.1}{3}=\dfrac{4}{15}\left(mol\right)\)
⇒ \(m_{Al2\left(SO4\right)3}=\dfrac{4}{15}.342=91,2\left(g\right)\)
\(n_{Al}=\dfrac{0,8.2}{3}=\dfrac{8}{15}\left(mol\right)\)
⇒ \(m_{Al}=\dfrac{8}{15}.27=14,4\left(g\right)\)
Chúc bạn học tốt
a, PT: \(2Al+6HCl\rightarrow2AlCl_3+3H_2\)
Ta có: \(n_{H_2}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\)
Theo PT: \(n_{HCl}=2n_{H_2}=0,6\left(mol\right)\)
\(\Rightarrow m_{HCl}=0,6.36,5=21,9\left(g\right)\)
b, Theo PT: \(n_{Al}=\dfrac{2}{3}n_{H_2}=0,2\left(mol\right)\)
\(\Rightarrow m_{Al}=0,2.27=5,4\left(g\right)\)
\(PTHH:2Al+6HCl->2AlCl_3+3H_2\)
0,2<--0,6<----------0,2<------0,3 (mol)
\(n_{H_2\left(dktc\right)}=\dfrac{V}{22,4}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\)
\(m_{HCl}=n\cdot M=0,6\cdot\left(1+35,5\right)=21,9\left(g\right)\)
\(m_{AlCl_3}=n\cdot M=0,2\cdot\left(27+35,5\cdot3\right)=26,7\left(g\right)\)
a, PT: 2Al+6HCl→2AlCl3+3H2
Ta có: nH2=6,7222,4=0,3(mol)
Theo PT: nHCl=2nH2=0,6(mol)
⇒mHCl=0,6.36,5=21,9(g)
b, Theo PT: nAl=23nH2=0,2(mol)
⇒mAl=0,2.27=5,4(g)
a.b.c.\(n_{Al}=\dfrac{2,7}{27}=0,1mol\)
\(2Al+6HCl\rightarrow2AlCl_3+3H_2\)
0,1 0,1 0,15 ( mol )
\(V_{H_2}=0,15.22,4=3,36l\)
\(m_{AlCl_3}=0,1.133,5=13,35g\)
d.\(Fe_2O_3+3H_2\rightarrow\left(t^o\right)2Fe+3H_2O\)
0,15 0,1 ( mol )
\(m_{Fe}=0,1.56=5,6g\)
a: \(2Al+6HCl\rightarrow2AlCl_3+3H_2\)
b: \(n_{AlCl_3}=\dfrac{26.7}{27+35.5\cdot3}=0.2\left(mol\right)\)
=>nAl=0,2(mol)
\(m=0.2\cdot27=5.4\left(g\right)\)
c: \(2\cdot n_{Al}=3\cdot n_{H_2}\Leftrightarrow n_{H_2}=\dfrac{2}{3}\cdot\dfrac{1}{5}=\dfrac{2}{15}\left(mol\right)\)
\(V=\dfrac{2}{15}\cdot22.4=\dfrac{224}{75}\left(lít\right)\)
a) \(PTHH:2Al+6HCl\xrightarrow[]{}2AlCl_3+3H_2\)
b) \(n_{H_2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)
\(n_{Al}=\dfrac{0,15.2}{3}=0,1\left(mol\right)\)
\(m_{Al}=0,1.27=2,7\left(g\right)\)
c)\(n_{AlCl_3}=\dfrac{0,15.2}{3}=0,1\left(mol\right)\)
\(m_{AlCl_3}=0,1.133,5=13,35\left(g\right)\)
a) \(n_{H_2}=\dfrac{13,44}{22,4}=0,6\left(mol\right)\)
PTHH: 2Al + 6HCl ---> 2AlCl3 + 3H2
Theo PTHH: \(n_{AlCl_3}=n_{Al}=\dfrac{2}{3}.n_{H_2}=\dfrac{2}{3}.0,6=0,4\left(mol\right)\)
=> mAl = 0,4.27 = 10,8 (g)
b) \(m_{AlCl_3}=0,4.133,5=53,4\left(g\right)\)
2Al+6HCl-to>2AlCl3+3H2
\(\dfrac{8}{15}\)------1,6--------\(\dfrac{8}{15}\)---0,8
n H2=\(\dfrac{17,92}{22,4}\)=0,8 mol
=>m Al=\(\dfrac{8}{15}\).27=14,4g
=>m HCl=1,6.36,5=58,4g
=>m AlCl3=\(\dfrac{8}{15}\).133,5=71,2g