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Ta có: \(n_{Fe}=\dfrac{5,6}{56}=0,1\left(mol\right)\)
PT: \(Fe+2HCl\rightarrow FeCl_2+H_2\)
____0,1______0,2_____0,1____0,1 (mol)
a, \(C_{M_{HCl}}=\dfrac{0,2}{0,15}=\dfrac{4}{3}\left(M\right)\)
\(V_{H_2}=0,1.22,4=2,24\left(l\right)\)
b, \(FeCl_2+2NaOH\rightarrow2NaCl+Fe\left(OH\right)_2\)
Theo PT: \(n_{NaOH}=2n_{FeCl_2}=0,2\left(mol\right)\)
\(\Rightarrow V_{NaOH}=\dfrac{0,2}{2}=0,1\left(l\right)\)
\(a)n_{MnO_2}=\dfrac{69,6}{87}=0,8mol\\ MnO_2+4HCl\xrightarrow[nhẹ]{đun}MnCl_2+Cl_2+H_2O\)
0,8 3,2 0,8 0,8 0,8
\(V_A=V_{Cl_2}=0,8.22,4=17,92l\\ b)Cl_2+2NaOH\rightarrow NaCl+NaClO+H_2O\)
0,8 1,6 0,8 0,8
\(V_{ddNaOH}=\dfrac{1,6}{1}=1,6l\\ C_{M_{NaCl}}=\dfrac{0,8}{1,6}=0,5M\\ C_{M_{NaClO}}=\dfrac{0,8}{1,6}=0,5M\)
\(13,n_{Fe}=\dfrac{16,8}{56}=0,3\left(mol\right)\\ PTHH:Fe+2HCl\rightarrow FeCl_2+H_2\\ .....0,3.....0,6......0,3......0,3\left(mol\right)\\ V_{H_2\left(đktc\right)}=0,3\cdot22,4=6,72\left(l\right)\\ 14,n_{CaCO_3}=\dfrac{25}{40+12+16\cdot3}=0,25\left(mol\right)\\ PTHH:CaCO_3+2HCl\rightarrow CaCl_2+H_2O+CO_2\\ .....0,25.....0,5......0,25......0,25......0,25\left(mol\right)\\ V_{CO_2\left(đktc\right)}=0,25\cdot22,4=5,6\left(l\right)\)
Tiếp bài của creeper nhé:
c. Ta có: \(n_{ZnO}=\dfrac{4,86}{81}=0,06\left(mol\right)\)
Theo PT(1): \(n_{HCl}=2.n_{ZnO}=2.0,06=0,12\left(mol\right)\)
Theo PT(2): \(n_{HCl}=2.n_{Zn}=2.0,1=0,2\left(mol\right)\)
=> \(n_{HCl}=0,12+0,2=0,32\left(mol\right)\)
=> \(m_{HCl}=0,32.36,5=11,68\left(g\right)\)
Ta có: \(C_{\%_{HCl}}=\dfrac{11,68}{m_{dd_{HCl}}}.100\%=12\%\)
=> \(m_{dd_{HCl}}=\dfrac{292}{3}\left(g\right)\)
Theo đề, ta có:
\(D=\dfrac{\dfrac{292}{3}}{V_{dd_{HCl}}}=1,2\)(g/ml)
=> \(V_{dd_{HCl}}=81,1\left(ml\right)\)
\(n_{Zn}=\dfrac{13}{65}=0,2\left(mol\right)\)
a) PTHH : \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
b) \(n_{HCl}=2n_{Zn}=0,4\left(mol\right)\Rightarrow C_{MddHCl}=\dfrac{0,4}{0,2}=2M\)
c) \(n_{H2}=n_{Zn}=0,2\left(mol\right)\Rightarrow V_{H2\left(dkc\right)}=0,2.24,79=4,958\left(l\right)\)
Sửa đề: 0,5 mol → 0,5 M
a, Ta có: \(n_{Zn}=\dfrac{2,6}{65}=0,04\left(mol\right)\)
PT: \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
Theo PT: \(n_{HCl}=2n_{Zn}=0,08\left(mol\right)\)
\(\Rightarrow V_{HCl}=\dfrac{0,08}{0,5}=0,16\left(l\right)\)
b, Theo PT: \(n_{H_2}=n_{Zn}=0,04\left(mol\right)\Rightarrow V_{H_2}=0,04.22,4=0,896\left(l\right)\)
Sửa đề 0,5mol ⇒ 0,5M
\(n_{Zn}=\dfrac{2,6}{65}=0,04\left(mol\right)\)
Pt : \(Zn+2HCl\rightarrow ZnCl_2+H_2\uparrow\)
0,04 0,08 0,04
a) \(V_{ddHCl}=\dfrac{0,08}{0,5}=0,16\left(l\right)\)
b) \(V_{H2\left(dktc\right)}=0,04.22,4=0,896\left(l\right)\)
Chúc bạn học tốt
\(n_{Fe}=\dfrac{2,8}{56}=0,05\left(mol\right)\)
PT :
\(Fe+2HCl\rightarrow FeCl_2+H_2\uparrow\)
0,05 0,1 0,05
\(a,V_{H_2}=0,05.22,4=1,12\left(l\right)\)
\(b,V_{HCl}=\dfrac{n}{C_M}=\dfrac{0,1}{2}=0,05\left(l\right)\)
nH2=\(\frac{6,72}{22,4}=0,3\)mol
PTHH
M+2HCl--> MCl2+H2
0,3mol<---------------0,3mol
=>MM=\(\frac{19,5}{0,3}=64\)
=> km loại là kẽm (Zn)
b) nNaOH=0,2.1=0,2 mol
PTHH
NaOH+HCl-->NaCl + H2O
0,2 mol--> 0,2 mol
---> thể tích HCl 1M đã dùng là V=\(\frac{0,2+0,3}{1}=0,5\)lít
=> CM(ZnCl2)=\(\frac{0,3}{0,5}=0,6M\)
\(a/n_{Fe}=\dfrac{22,4}{56}=0,4mol\\ Fe+2HCl\rightarrow FeCl_2+H_2\)
0,4 0,8 0,4 0,4
\(V_{ddHCl}=\dfrac{0,8}{1}=0,8l\\ b/V_{H_2}=0,4.22,4=8,96l\)