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\(n_{H_2}=\dfrac{4.48}{22.4}=0.2\left(mol\right)\)
\(n_{Fe}=n_{H_2}=0.2\left(mol\right)\)
\(m_{Cu}=m_{hh}-m_{Fe}=17.6-0.2\cdot56=6.4\left(g\right)\)
\(n_{Cu}=\dfrac{6.4}{64}=0.1\left(mol\right)\)
\(\Rightarrow m_{CuO}=0.1\cdot80=8\left(g\right)\)
\(m_{Fe_xO_y}=m_{hh}-m_{CuO}=24-8=16\left(g\right)\)
\(M_{Fe_xO_y}=\dfrac{16}{\dfrac{0.2}{x}}=80x\left(đvc\right)\)
\(\Leftrightarrow56x+16y=80x\)
\(\Leftrightarrow24x=16y\)
\(\Leftrightarrow\dfrac{x}{y}=\dfrac{16}{24}=\dfrac{2}{3}\)
\(CT:Fe_2O_3\)
\(Fe + 2HCl \to FeCl_2 + H_2\\ n_{Fe} = n_{H_2} = \dfrac{4,48}{22,4} = 0,2\ mol\\ \Rightarrow n_{Cu} = \dfrac{17,6-0,2.56}{64} = 0,1\ mol\)
BTNT với Fe,Cu
\(n_{CuO} = n_{Cu} = 0,1\ mol\\ n_{Fe_xO_y} = \dfrac{n_{Fe}}{x} = \dfrac{0,2}{x}mol\)
Suy ra ;
\(0,1.80 + \dfrac{0,2}{x}.(56x+16y) = 24\\ \Rightarrow \dfrac{x}{y} = \dfrac{2}{3}\)
Vậy oxit sắt cần tìm : Fe2O3
\(n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right)\)
Pt : \(Fe+2HCl\rightarrow FeCl_2+H_2|\)
1 2 1 1
0,2 0,4 0,2 0,2
a) \(n_{H2}=\dfrac{0,2.1}{1}=0,2\left(mol\right)\)
\(V_{H2\left(dktc\right)}=0,2.22,4=4,48\left(l\right)\)
b) \(n_{FeCl2}=\dfrac{0,2.1}{1}=0,2\left(mol\right)\)
⇒ \(m_{FeCl2}=0,2.127=25,4\left(g\right)\)
c) \(n_{HCl}=\dfrac{0,2.2}{1}=0,4\left(mol\right)\)
⇒ \(m_{HCl}=0,.4.36,5=14,6\left(g\right)\)
Chúc bạn học tốt
\(a.Zn+2HCl\rightarrow ZnCl_2+H_2\\ b.n_{Zn}=n_{ZnCl_2}=0,1\left(mol\right)\\ \Rightarrow m_{ZnCl_2}=0,1.136=13,6\left(g\right)\\ c.n_{H_2}=n_{Zn}=0,1\left(mol\right)\\ \Rightarrow V_{H_2}=0,1.22,4=2,24\left(l\right)\)
a) Zn + 2HCl → ZnCl2 + H2
b) mZnCl2 = 0,1 . 136 = 13,6 gam
c) nZn = 6,5/65 = 0,1 mol . Theo tỉ lệ pư => nH2 = nZn = nZnCl2 =0,1 mol <=> VH2(đktc) = 0,1.22,4 = 2,24 lít.
\(n_{Fe_2O_3}=\dfrac{16}{160}=0,1\left(mol\right)\)
PTHH: Fe2O3 + 3H2 --to--> 2Fe + 3H2O
0,1---->0,3
Zn + H2SO4 --> ZnSO4 + H2
0,3<--------------------0,3
=> m = 0,3.65 = 19,5 (g)
a) \(n_{Fe}=\dfrac{12}{56}=\dfrac{3}{14}\left(mol\right)\)
PTHH: \(Fe+2HCl\rightarrow FeCl_2+H_2\)
\(\dfrac{3}{14}\)---------------------->\(\dfrac{3}{14}\)
\(\Rightarrow V_{H_2}=\dfrac{3}{14}.22,4=4,8\left(l\right)\)
b) \(n_{ZnO}=\dfrac{8,1}{81}=0,1\left(mol\right)\)
PTHH: \(ZnO+H_2\xrightarrow[]{t^o}Zn+H_2O\)
Xét tỉ lệ: \(0,1< \dfrac{3}{14}\Rightarrow H_2\) dư
Theo PT: \(n_{Zn}=n_{ZnO}=0,1\left(mol\right)\Rightarrow m_{Zn}=0,1.65=6,5\left(g\right)\)
\(Fe+2HCl\rightarrow FeCl_2+H_2\)
\(1mol\) \(1mol\)
\(\dfrac{3}{14}mol\) \(\dfrac{3}{14}mol\)
\(a)n_{Fe}=\dfrac{m}{M}=\dfrac{12}{56}\approx0,21=\dfrac{3}{14}\left(mol\right)\)
\(V_{H_2}=n.22,4=\dfrac{3}{14}.22,4=4,8\left(l\right)\)
\(b)n_{ZnO}=\dfrac{m}{M}=\dfrac{8,1}{81}=0,1\left(mol\right)\)
\(ZnO+H_2\rightarrow Zn+H_2O\)
\(1mol\) \(1mol\) \(1mol\)
\(0,1mol\) \(0,1mol\) \(0,1mol\)
\(\text{Ta thấy }H_2\text{ dư,ZnO phản ứng hết.Bài toán tính theo ZnO}\)
\(m_{Zn}=n.M=0,1.65=6,5\left(g\right)\)
a) \(n_O=\dfrac{34,8-25,2}{16}=0,6\left(mol\right)\)
=> \(n_{H_2O}=0,6\left(mol\right)\) (bảo toàn O)
=> \(n_{H_2}=0,6\left(mol\right)\) (bảo toàn H)
=> \(V_{H_2}=0,6.22,4=13,44\left(l\right)\)
b) \(n_{Fe}=\dfrac{25,2}{56}=0,45\left(mol\right)\)
nFe : nO = 0,45 : 0,6 = 3 : 4
=> CTHH: Fe3O4
c) \(m_{H_2O}=0,6.18=10,8\left(g\right)\)
Mà \(d_{H_2O}=1\left(g/ml\right)\)
=> \(V_{H_2O}=10,8\left(ml\right)\)
\(n_{Fe}=\dfrac{10,5}{56}=0,1875\left(mol\right)\)
PTHH: X + 2nHCl → XCln + nH2
Mol: \(\dfrac{0,25}{n}\) 0,25
PTHH: Fe3O4 + 4H2 → 3Fe + 4H2O
Mol: 0,25 0,1875
\(\Rightarrow M_X=\dfrac{14}{\dfrac{0,25}{n}}=56n\left(g/mol\right)\)
Vì X là kim loại nên X có hóa trị là I,ll,lll
⇒ X là sắt (Fe)
Fe+2HCl→FeCl2+H2
nFe=1456=0,25mol
nH2=nFe=0,25mol
nFeCl2=nFe=0,25mol
mFeCl2=0,25.127=31,75gam
H2+CuOt0→Cu+H2O
nCuO=25,680=0,32mol
Tỉ lệ: 0,251<0,321→CuO dư
nCu=nCuO=nH2=0,25mol
mCu=0,25.64=16gam
nCuO(dư)=0,32−0,25=0,07mol
mCuO=0,07.80=5,6gam