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`n_[Al]=[2,7]/27=0,1(mol)`
`2Al + 6HCl -> 2AlCl_3 + 3H_2 \uparrow`
`0,1` `0,3` `0,1` `0,15` `(mol)`
`a)V_[H_2]=0,15.22,4=3,36(l)`
`b)V_[dd HCl]=[0,3]/2=0,15(l)`
`=>C_[M_[AlCl_3]]=[0,1]/[0,15]~~0,67(M)`
\(n_{Al}=\dfrac{2,7}{27}=0,1\left(mol\right)\\ pthh:2Al+6HCl\rightarrow2AlCl_3+3H_2\)
0,1 0,3 0,1 0,15
\(V_{H_2}=0,15.22,4=3,36\left(l\right)\\ V_{HCl}=\dfrac{0,3}{2}=0,15\left(l\right)\\ C_{M\left(AlCl_3\right)}=\dfrac{0,1}{0,15}=\dfrac{2}{3}M\)
\(n_{Mg}=\dfrac{9,6}{24}=0,4\left(mol\right)\)
Pt : \(Mg+2HCl\rightarrow MgCl_2+H_2|\)
1 2 1 1
0,4 0,8 0,4
\(n_{HCl}=\dfrac{0,4.2}{1}=0,8\left(mol\right)\)
\(V_{ddHCl}=\dfrac{0,8}{0,5}=1,6\left(l\right)\)
\(n_{MgCl2}=\dfrac{0,8.1}{2}=0,4\left(mol\right)\)
\(C_{M_{MgCl2}}=\dfrac{0,4}{1,6}=0,25\left(M\right)\)
Chúc bạn học tốt
\(n_{Mg}=\dfrac{9,6}{24}=0,4\left(mol\right)\\ Mg+2HCl\rightarrow MgCl_2+H_2\\ 0,4.......0,8.......0,4......0,4\left(mol\right)\\ V_{ddHCl}=\dfrac{0,8}{0,5}=1,6\left(l\right)\\ V_{ddMgCl_2}=V_{ddHCl}=1,6\left(l\right)\\ \Rightarrow C_{MddMgCl_2}=\dfrac{0,4}{1,6}=0,25\left(M\right)\)
a) \(n_{Fe}=\dfrac{2,8}{56}=0,05\left(mol\right)\)
PTHH: `Fe + 2HCl -> FeCl_2 + H_2`
0,05->0,1----->0,05---->0,05
`=> V_{ddHCl} = (0,1)/2 = 0,05 (l)`
b) `V_{H_2} = 0,05.22,4 = 1,12 (l)`
c) `C_{M(FeCl_2)} = (0,05)/(0,05) = 1M`
\(a)n_{Al}=\dfrac{10,8}{27}=0,4\left(mol\right)\\ 2Al+6HCl\xrightarrow[]{}2AlCl_3+3H_2\\ n_{H_2}=\dfrac{3}{2}n_{Al}=\dfrac{3}{2}\cdot0,4=0,6\left(mol\right)\\ V_{H_2}=0,6.22,4=13,44\left(l\right)\\ b)n_{HCl}=3n_{Al}=3.0,4=1,2\left(mol\right)\\ m_{HCl}=1,2.36,5=43,8\left(g\right)\\ m_{dd_{HCl}}=\dfrac{43,8}{10,95\%}\cdot100\%=400\left(g\right)\\ c)n_{AlCl_3}=n_{Al}=0,4mol\\ m_{AlCl_3}=0,4.133,5=53,4\left(g\right)\\ m_{H_2}=0,6.2=1,2\left(g\right)\\ m_{dd_{AlCl_3}}=10,8+400-1,2=409,6\left(g\right)\\ C_{\%AlCl_3}=\dfrac{53,4}{409,6}\cdot100\%\approx13\%\)
Câu 1
\(a)PTHH:Mg+2HCl\rightarrow MgCl_2+H_2\\
b)200ml=0,2l\\
n_{HCl}=0,2.1=0,2mol\\
n_{H_2}=n_{MgCl_2}=\dfrac{1}{2}n_{H_2}=\dfrac{1}{2}\cdot0,2=0,1mol\\
V_{H_2}=0,1.24,79=2,479l\\
c)C_{M_{MgCl_2}}=\dfrac{0,1}{0,2}=0,5M\)
\(n_{Al}=\frac{10,8}{27}=0,4\left(mol\right)\)
\(2Al+6HCl->2AlCl_3+3H_2\) (1)
theo (1) \(n_{H_2}=\frac{3}{2}n_{Al}=0,6\left(mol\right)\)
=> \(V_{H_2}=0,6.22,4=13,44\left(l\right)\)
Cho 10,08 g nhom tac dung vua du voi dung dich axit HCl.2M
a) viet phuong trinh phan ung va tinh the tich H2(dktc)
b) tinh the tich dung dich axit HCl.2M da dung
\(n_{Al}=\dfrac{4.5}{27}=\dfrac{1}{6}\left(mol\right)\)
\(2Al+6HCl\rightarrow2AlCl_3+3H_2\)
\(\dfrac{1}{6}.....0.5.......\dfrac{1}{6}.......0.25\)
\(m_{HCl}=0.5\cdot36.5=18.25\left(g\right)\)
\(m_{AlCl_3}=\dfrac{1}{6}\cdot133.5=22.25\left(g\right)\)
\(V_{H_2}=0.25\cdot22.4=5.6\left(l\right)\)
1//// nAl=0,4mol
2Al + 6HCl -----> 2AlCl3 + 3H2
0,4mol 1,2mol 0,4mol 0,6 mol
a/ VH2=0,6.22,4=13,44 l
b/ V=1,2/2=0,6 l
CAlCl3=0,4/0,6=2/3 M