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a) 2Al + 3Cl2 --to--> 2AlCl3
b) \(n_{Al}=\dfrac{2,7}{27}=0,1\left(mol\right)\)
2Al + 3Cl2 --to--> 2AlCl3
0,1----------------->0,1
=> mAlCl3 = 0,1.133,5 = 13,35 (g)
=> \(C_M=\dfrac{0,1}{0,1}=1M\)
a) 2Fe + 3Cl2 --> 2FeCl3
b) \(n_{Fe}=\dfrac{5,6}{56}=0.1\left(mol\right)\)
2Fe + 3Cl2 --> 2FeCl3
0,1------------------->0,1
=> mFeCl3 = 0,1.162,5=16,25(g)
c) \(C_M=\dfrac{0,1}{0,1}=1M\)
Ta có:
nFe=\(\dfrac{5,6}{56}=0,1\left(mol\right)\)
a, PT:
2Fe+3Cl2to→2FeCl32Fe+3Cl2to→2FeC0,1___0,15___0,1 (mol)
b, Có: mFeCl3=0,1.162,5=16,25(g)mFeCl3=0,1.162,5=16,25(g)
c, CMFeCl3=\(\dfrac{0,1}{0,1}=1\) M
a) PTHH: \(Fe+H_2SO_4\rightarrow FeSO_4+H_2\uparrow\)
b) Ta có: \(n_{Fe}=\dfrac{0,56}{56}=0,01\left(mol\right)=n_{FeSO_4}=n_{H_2}\)
\(\Rightarrow\left\{{}\begin{matrix}m_{FeSO_4}=0,01\cdot152=1,52\left(g\right)\\V_{H_2}=0,01\cdot22,4=0,224\left(l\right)\end{matrix}\right.\)
c) Theo PTHH: \(n_{Fe}=n_{H_2SO_4}=0,01\left(mol\right)\)
\(\Rightarrow m_{ddH_2SO_4}=\dfrac{0,01\cdot98}{19,6\%}=5\left(g\right)\)
a. PTHH: Zn + H2SO4 ---> ZnSO4 + H2↑
b. Ta có: \(C_{M_{H_2SO_4}}=\dfrac{n_{H_2SO_4}}{200:1000}=1,5M\)
=> \(n_{H_2SO_4}=0,3\left(mol\right)\)
Ta lại có: \(n_{Zn}=\dfrac{16,25}{65}=0,25\left(mol\right)\)
Ta thấy: \(\dfrac{0,3}{1}>\dfrac{0,25}{1}\)
Vậy H2SO4 dư.
Theo PT: \(n_{H_2}=n_{Zn}=0,25\left(mol\right)\)
=> \(V_{H_2}=0,25.22,4=5,6\left(lít\right)\)
c. Theo PT: \(n_{ZnSO_4}=n_{Zn}=0,25\left(mol\right)\)
=> \(m_{ZnSO_4}=0,25.161=40,25\left(g\right)\)
d. Ta có: \(V_{dd_{ZnSO_4}}=0,2\left(lít\right)\)
=> \(C_{M_{ZnSO_4}}=\dfrac{0,25}{0,2}=1,25M\)
\(n_{Zn}=\dfrac{9,75}{65}=0,15mol\)
\(Zn+2HCl\rightarrow ZnCl_2+H_2\)
0,15 0,3 0,15 0,15
\(m_{ZnCl_2}=0,15\cdot136=20,4\left(g\right)\)
\(V_{H_2}=0,15\cdot22,4=3,36\left(l\right)\)
\(C_{M_{HCl}}=\dfrac{0,3}{0,1}=3M\)
\(a,PTHH:Fe+2HCl\rightarrow FeCl_2+H_2\\ b,n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right)\\ \Rightarrow n_{HCl}=2n_{Fe}=0,4\left(mol\right)\\ \Rightarrow C_{M_{HCl}}=\dfrac{0,4}{0,2}=2M\\ c,PTHH:HCl+NaOH\rightarrow NaCl+H_2O\\ \Rightarrow n_{NaOH}=n_{HCl}=0,4\left(mol\right)\\ \Rightarrow m_{CT_{NaOH}}=0,4\cdot40=16\left(g\right)\\ \Rightarrow m_{dd_{NaOH}}=\dfrac{16\cdot100\%}{16\%}=100\left(g\right)\)
Tham khảo
a.Fe+2HCL--> FeCl2+H2
b.Ta có số mol của sắt: n = 11,2/56=0,2 (mol)
Theo PTHH, ta có : 1 mol Fe -->1 mol H2
0,2 mol Fe --> 0,2 mol H2
Do đó, thể tích của H2 là :
V = n . 22,4 = 0,2 . 22,4 =4,48 (lít)
c. Ta có: C% = (0,2 . 56 / (0,2 . 2). 36,5 ).100% =76,71 % (mk không chắc chắn đâu )
d.Theo PTHH, ta có : 1 mol Fe --> 1 mol FeCl2
0,2 mol Fe --> 0,2 mol FeCl2
Do đó, khối lương muối tạo thành :
m = n . M = 0,2 . 127 = 25,4 (g)
a) \(n_{Al}=\dfrac{5,4}{27}=0,2\left(mol\right)\)
PTHH: 2Al + 3H2SO4 --> Al2(SO4)3 + 3H2
______0,2---->0,3------------>0,1------>0,3______(mol)
=> VH2 = 0,3.22,4= 6,72(l)
b) \(C_{M\left(H_2SO_4\right)}=\dfrac{0,3}{0,1}=3M\)
\(C_{M\left(Al_2\left(SO_4\right)_3\right)}=\dfrac{0,1}{0,1}=1M\)
Câu 3:
\(n_{H_2}=\dfrac{6,72}{22,4}=0,3(mol)\\ PTHH:Mg+2HCl\to MgCl_2+H_2\\ MgO+2HCl\to MgCl_2+H_2O\\ \Rightarrow n_{Mg}=n_{H_2}=0,3(mol)\\ \Rightarrow \%_{Mg}=\dfrac{0,3.24}{15,2}.100\%=47,37\%\\ \Rightarrow \%_{MgO}=100\%-47,37\%=52,63\%\)
\(n_{MgO}=\dfrac{15,2-0,3.24}{40}=0,2(mol)\\ \Rightarrow \Sigma n_{HCl}=0,3.2+0,2.2=1(mol)\\ \Rightarrow m_{dd_{HCl}}=\dfrac{1.36,5}{10\%}=365(g)\\ \Sigma n_{MgCl_2}=0,2+0,3=0,5(mol)\\ \Rightarrow C\%_{MgCl_2}=\dfrac{0,5.95}{15,2+365}.100\%=12,49\%\)
\(PTHH:Mg+2H_2SO_{4(đ)}\to MgSO_4+2H_2O+SO_2\uparrow\\ MgO+H_2SO_4\to MgSO_4+H_2O\\ \Rightarrow n_{SO_2}=n_{Mg}=0,3(mol)\\ \Rightarrow V_{SO_2}=0,3.22,4=6,72(l)\)
Ta có: \(n_{Fe}=\dfrac{5,6}{56}=0,1\left(mol\right)\)
a, PT: \(2Fe+3Cl_2\underrightarrow{t^o}2FeCl_3\)
______0,1___0,15___0,1 (mol)
b, Có: \(m_{FeCl_3}=0,1.162,5=16,25\left(g\right)\)
c, \(C_{M_{FeCl_3}}=\dfrac{0,1}{0,1}=1M\)
Bạn tham khảo nhé!