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a, PT: \(Al_2O_3+6HCl\rightarrow2AlCl_3+3H_2\)
b, Ta có: \(n_{Al_2O_3}=\dfrac{10,2}{102}=0,1\left(mol\right)\)
Theo PT: \(n_{HCl}=6n_{Al_2O_3}=0,6\left(mol\right)\)
\(\Rightarrow m_{HCl}=0,6.36,5=21,9\left(g\right)\)
a. \(n_{Al_2O_3}=\dfrac{10,2}{102}=0,1\left(mol\right)\)
PTHH : Al2O3 + 6HCl -> 2AlCl3 + 3H2O
0,1 0,6 0,2 ( mol )
\(m_{HCl}=0,6.36,5=21,9\left(g\right)\)
\(m_{AlCl_3}=0,2.133,5=26,7\left(g\right)\)
b.
PTHH : 3O2 + 4Al -> 2Al2O3
0,15 0,1 ( mol)
\(V_{O_2}=0,15.22,4=3,36\left(l\right)\)
a. \(n_{Al_2O_3}=\dfrac{10,2}{102}=0,1\left(mol\right)\)
PTHH : Al2O3 + 3HCl -> 2AlCl3 + 3H2O
0,1 0,3 0,2 ( mol )
\(m_{HCl}=0,3.36,5=10,95\left(g\right)\)
\(m_{AlCl_3}=0,2.133,5=26,7\left(g\right)\)
b.
PTHH : 3O2 + 4Al -> 2Al2O3
0,15 0,1 ( mol)
\(V_{O_2}=0,15.22,4=3,36\left(l\right)\)
\(n_{HCl}=0,05.1,5=0,075\left(mol\right);n_{H_2}=0,03\left(mol\right)\\ PTHH:2Al+6HCl\rightarrow2AlCl_3+3H_2\\ Vì:\dfrac{0,075}{6}>\dfrac{0,03}{3}\Rightarrow HCldư\\ a,n_{H_2\left(TT\right)}=\dfrac{0,075}{2}=0,0375\left(mol\right)\\ H=\dfrac{0,03}{0,0375}.100\%=80\%\\ b,n_{Al}=n_{AlCl_3}=\dfrac{2}{3}.0,03=0,02\left(mol\right)\Rightarrow m_{Al}=0,02.27=0,54\left(g\right)\\ c,m_{AlCl_3}=0,02.133,5=2,67\left(g\right)\)
Ta có: \(n_{Al}=\dfrac{m_{Al}}{M_{Al}}=\dfrac{2,7}{27}=0,1\left(mol\right)\)
PT: \(2Al+6HCl\rightarrow2AlCl_3+3H_2\)
a, Theo PT: \(n_{H_2\left(LT\right)}=\dfrac{3}{2}n_{Al}=0,15\left(mol\right)\)
\(\Rightarrow V_{H_2\left(LT\right)}=0,15.24,79=3,7185\left(l\right)\)
\(\Rightarrow H=\dfrac{V_{H_2\left(TT\right)}}{V_{H_2\left(LT\right)}}.100\%=\dfrac{2,479}{3,7185}.100\%\approx66,67\%\)
b, \(n_{HCl}=\dfrac{6}{2}n_{Al}=0,3\left(mol\right)\)
\(\Rightarrow V_{HCl}=\dfrac{n_{HCl}}{C_{M_{HCl}}}=\dfrac{0,3}{1,5}=0,2\left(l\right)\)
c, \(n_{AlCl_3}=n_{Al}=0,1\left(mol\right)\)
\(\Rightarrow m_{AlCl_3}=n_{AlCl_3}.M_{AlCl_3}=0,1.133,5=13,35\left(g\right)\)
a)
\(n_{Al}=\dfrac{5,4}{27}=0,2\left(mol\right)\)
PTHH: 2Al + 6HCl --> 2AlCl3 + 3H2
0,2----------->0,2----->0,3
=> \(V_{H_2}=0,3.22,4=6,72\left(l\right)\)
b) \(m_{AlCl_3}=0,2.133,5=26,7\left(g\right)\)
c)
PTHH: Zn + H2SO4 --> ZnSO4 + H2
0,3<----------------0,3
=> \(m_{H_2SO_4}=0,3.98=29,4\left(g\right)\)
\(a,n_{Al}=\dfrac{5,4}{27}=0,2\left(mol\right)\)
PTHH:
\(2Al+6HCl\rightarrow2AlCl_3+3H_2\)
0,2--------------->0,2------->0,3
\(V_{H_2}=0,3.22,4=6,72\left(l\right)\\ b,m_{AlCl_3}=0,2.133,5=26,7\left(g\right)\)
c, PTHH:
\(Zn+H_2SO_4\rightarrow ZnSO_4+H_2\)
0,2<------------------0,2
\(m_{H_2SO_4}=0,2.98=19,6\left(g\right)\)
nAl = \(\frac{4,05}{27}=0,15mol\)
2Al + 6HCl ----> 2AlCl3 + 3 H2
0,15 0,45 0,15 0,225 (mol)
a) nHCl = 0,45 mol
=> mHCl = 0,45 . 36,5 = 16,425 g
b) nAlCl3 = 0,15 mol
=> mAlCl3 = 0,15 . 133,5 = 20,025 g
c) nH2 = 0,225 mol
=> mH2 = 0,225 . 2 = 0,45 g
=> VH2 = 0,225 . 22,4 = 5,04 lit
\(n_{Al}=\dfrac{5,4}{27}=0,2\left(mol\right)\)
PTHH:
\(2Al+6HCl\rightarrow2AlCl_3+3H_2\uparrow\)
0,2 0,2 0,3
\(V_{H_2}=n.22,4=6,72\left(l\right)\)
\(m_{AlCl_3}=n.M=0,2.133,5=26,7\left(g\right)\)
18,25 là số gam của dd mà sao tính đc công thức đấy , dd tính theo công thức n/V thôi chứ .
\(n_{Al}=\dfrac{m_{Al}}{M_{Al}}=\dfrac{5,4}{27}=0,2mol\)
\(2Al+6HCl\rightarrow2AlCl_3+3H_2\)
0,2 0,2 0,3 ( mol )
\(V_{H_2}=n_{H_2}.22,4=0,3.22,4=6,72l\)
\(m_{AlCl_3}=n_{AlCl_3}.M_{AlCl_3}=0,2.133,5=26,7g\)
PTHH: \(Al_2O_3+6HCl\rightarrow2AlCl_3+3H_2O\)
\(nHCl=\frac{m}{M}=\frac{22,55}{36,5}=0,62mol\)
Theo PTHH: \(nAl_3Cl_3=0,62.\frac{2}{6}=0,20mol\)
\(\rightarrow m_{AlCl_3}=M.n=\left(27+35,5.3\right).0,20=26,7g\)
hoàn toàn là hòa tan nhá mn:)