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\(a,n_{Mg}=\dfrac{2,4}{24}=0,1\left(mol\right);n_{Al}=\dfrac{2,7}{27}=0,1\left(mol\right)\\ Mg+Cl_2\rightarrow\left(t^o\right)MgCl_2\\ 2Al+3Cl_2\rightarrow\left(t^o\right)2AlCl_3\\ n_{Cl_2}=n_{Mg}+1,5.n_{Al}=0,1+1,5.0,1=0,25\left(mol\right)\\ \Rightarrow V=V_{Cl_2\left(đktc\right)}=0,25.22,4=5,6\left(l\right)\\ b,MgCl_2+2KOH\rightarrow Mg\left(OH\right)_2\downarrow+2KCl\\ AlCl_3+3KOH\rightarrow Al\left(OH\right)_3\downarrow+3KCl\\KT.max\Leftrightarrow Al\left(OH\right)_3.không.tan.trong.kiềm\\ n_{Mg\left(OH\right)_2}=n_{MgCl_2}=n_{Mg}=0,1\left(mol\right);n_{Al\left(OH\right)_3}=n_{AlCl_3}=n_{Al}=0,1\left(mol\right)\\ \Rightarrow m_{\downarrow\left(max\right)}=0,1.58+0,1.78=13,6\left(g\right)\)
\(n_{KOH}=2.0,1+3.0,1=0,5\left(mol\right)\\ \Rightarrow m_{KOH}=0,5.56=28\left(g\right)\\ m_{ddKOH}=\dfrac{28.100}{4}=700\left(g\right)\\ c,MnO_2+4HCl_{đặc,nóng}\rightarrow MnCl_2+Cl_2+2H_2O\\ n_{MnO_2}=n_{Cl_2}=0,25\left(mol\right)\\ \Rightarrow m_{MnO_2}=0,25.87=21,75\left(g\right)\)
a) nCl2=7,28/22,4=0,325(mol)
=> mCl2=0,325.71=23,075(mol)
=> m(muối)= m(hh)+ mCl2= 10,45+23,075=33,525(g)
b) PTHH: 2 Al + 3 Cl2 -to-> 2 AlCl3
a__________1,5a(mol)
Cu + Cl2 -to-> CuCl2
b___b(mol)
Ta có hpt:
\(\left\{{}\begin{matrix}27a+64b=10,45\\1,5a+b=0,325\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}a=0,15\\b=0,1\end{matrix}\right.\)
=> mCu=0,1.64=6,4(g)
=>%mCu= (6,4/10,45).100=61,244%
=>%mAl=38,756%
Bài 1:
\(n_{HCl}=2.0,16=0,32\left(mol\right);n_{H_2}=\dfrac{3,584}{22,4}=0,16\left(mol\right)\)
PTHH: Mg + 2HCl → MgCl2 + H2
PTHH: Fe + 2HCl → FeCl2 + H2
\(m_{H_2}=0,16.2=0,32\left(g\right)\)
\(m_{HCl}=0,32.36,5=11,68\left(g\right)\)
Theo ĐLBTKL ta có: \(m_{MgCl_2+FeCl_2}=1,4+11,68-0,32=12,76\left(g\right)\)
Bài 12:
Theo ĐLBTKL, ta có:
\(m_{hhkl}+m_{O_2}=m_{hh.oxit}\\ \Leftrightarrow11,9+m_{O_2}=18,3\\ \Leftrightarrow m_{O_2}=18,3-11,9=6,4\left(g\right)\\ n_{O_2}=\dfrac{6,4}{32}=0,2\left(mol\right)\\ V_{O_2\left(đktc\right)}=0,2.22,4=4,48\left(l\right)\)
2Al+3H2SO4 → Al2(SO4)3+3H2
Ta có:
nAl=0,26mol => nH2=1,5nAl=0,39mol
=> VH2=0,39.22,4 = 8,84l
=> nH2SO4=nH2=0,39mol
=> CMH2SO4= nV=1,95M3
BaCl2+Al2(SO4)3 → 3BaSO4+2AlCl3
nBaSO4=3nAl2(SO4)3=3.12nAl=0,39mol
=> mBaSO4=90,87g
2Al+6H2SO4 → nAl2(SO4)3+3SO2+6H2O
nAl=0,2mol
=> nSO2=1,5nAl=0,3mol
=> mSO2=19,2g
Đáp án A.
Gọi nAl = a mol, nZn = b mol.
Ta có: 27a + 65b = 9,2 (*)
3a + 2b = 0,5 (**)
Giải (*), (**): a = b = 0,1 mol.
m muối = mKl + M gốc axit. ne/2
= 3,92 + 96. 0,25 = 33,2 g
Ta thấy khi cho Br 2 vào dung dịch 2 muối S 4 + thì toàn bộ S 4 + sẽ bị oxi hoá lên S 6 + ( SO 4 2 - )do đó :
n SO 2 = n SO 4 2 - = 0,15
=> m BaSO 4 = 0,15.233 = 34,95g
PT: \(Fe+2HCl\rightarrow FeCl_2+H_2\)
Ta có: \(n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right)\)
Theo PT: \(\left\{{}\begin{matrix}n_{H_2}=n_{FeCl_2}=n_{Fe}=0,2\left(mol\right)\\n_{HCl}=2n_{Fe}=0,4\left(mol\right)\end{matrix}\right.\)
a, Ta có: \(V_{H_2}=0,2.22,4=4,48\left(l\right)\)
b, \(V_{ddHCl}=\dfrac{0,4}{1,5}\approx0,267\left(l\right)\)
c, \(m_{FeCl_2}=0,2.127=25,4\left(g\right)\)
Bạn tham khảo nhé!
nAl = 5,4 / 27 = 0,2(mol)
2Al + 3H2SO4--- > Al2(SO4)3 + 3H2
0,2 0,3 0,1 0,3 (mol)
VH2SO4 = n/ CM = 0,3 / 2 = 0,15(l)
=> V1 = 150 ml
mAl2(SO4)3 = 0,1 . 342 = 34,2 (g)
Al2(SO4)3 + 3BaCl2 -- > 3BaSO4 + 2AlCl3
0,1 0,1
=> mBaSO4 = 0,1 . 233 = 23,3 (g)