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\(Fe+2HCl\rightarrow FeCl_2+H_2\\ n_{H_2}=n_{Fe}=0,15\left(mol\right)\\ \Rightarrow m_{Fe}=0,15.56=8,4\left(g\right)\\ ChấtrắnkhôngtanlàCu\\ Cu+Cl_2\text{ }\rightarrow CuCl_2\\ n_{Cu}=n_{Cl_2}=0,2\left(mol\right)\\ \Rightarrow m_{Cu}=0,2.64=12,8\left(g\right)\\ \%m_{Fe}=\dfrac{8,4}{8,4+12,8}.100=39,62\%\\ \%m_{Cu}=100-39,62=60,38\%\)
nH2 = 0,3 mol
- Cu không phản ứng với HCl
Fe + 2HCl \(\rightarrow\) FeCl2 + H2
\(\Rightarrow\) mFe = 0,3.56 = 16,8 (g)
\(\Rightarrow\) mCu = 25 - 16,8 = 8,2 (g)
\(\Rightarrow\) mHCl đã dùng = \(\dfrac{0,3.36,5.100}{14,6}\) = 75 (g)
\(\Rightarrow\) mdd sau phản ứng = 25 + 75 - ( 0,3.2 ) - 8,2 = 91,2 (g)
\(\Rightarrow\) C% = \(\dfrac{0,3.127.100}{91,2}\) = 41,77%
a,Fe + 2HCl → FeCl + H2 (1)
FeO + 2HCl → FeCl + H2O (2)
nH2 = 3,36/ 22,4 = 0,15 ( mol)
Theo (1) nH2 = nFe = 0,15 ( mol)
mFe = 0,15 x 56 = 8.4 (g)
m FeO = 12 - 8,4 = 3,6 (g)
a, \(n_{H_2}=\frac{3,36}{22,4}=0,15\left(mol\right)\)
\(Fe+2HCl->FeCl_2+H_2\left(1\right)\)
\(FeO+2HCl->FeCl_2+H_2O\left(2\right)\)
theo (1) \(n_{Fe}=n_{H_2}=0,15\left(mol\right)\)
=> \(m_{Fe}=0,15.56=8,4\left(g\right)\)
=> \(m_{FeO}=12-8,4=3,6\left(g\right)\)
ta thấy : nFe =nH2 = 0,15
=> mFe =0,15 x 56 = 8,4g
%Fe=8,4/12 x 100 = 70%
=>%FeO = 100 - 70 = 30%
b) BTKLra mdd tìm mct of HCl
c) tìm mdd sau pứ -mH2 nha bạn
Sửa đề: 34,48 → 4,48
a, - Phần 1: \(Fe+2HCl\rightarrow FeCl_2+H_2\) (1)
\(Fe_2O_3+6HCl\rightarrow2FeCl_3+3H_2O\) (2)
- Phần 2: \(Fe_2O_3+3H_2\underrightarrow{t^o}2Fe+3H_2O\) (3)
b, Ta có: \(n_{H_2}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\)
Theo PT (1): \(n_{Fe\left(1\right)}=n_{H_2}=0,2\left(mol\right)\)
\(n_{Fe}=\dfrac{33,6}{56}=0,6\left(mol\right)=n_{Fe\left(3\right)}+n_{Fe\left(1\right)}\)
\(\Rightarrow n_{Fe\left(3\right)}=0,4\left(mol\right)\)
Theo PT (3): \(n_{Fe_2O_3}=\dfrac{1}{2}n_{Fe\left(3\right)}=0,2\left(mol\right)\)
\(\Rightarrow m_X=2.\left(m_{Fe\left(1\right)}+m_{Fe_2O_3}\right)=2.\left(0,2.56+0,2.160\right)=86,4\left(g\right)\)
PTHH: \(Mg+2HCl\rightarrow MgCl_2+H_2\uparrow\)
\(2Al+6HCl\rightarrow2AlCl_3+3H_2\uparrow\)
\(Fe+2HCl\rightarrow FeCl_2+H_2\uparrow\)
a) Ta có: \(\left\{{}\begin{matrix}n_{HCl}=\dfrac{12,7}{36,5}=\dfrac{127}{365}\left(mol\right)\\n_{H_2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\end{matrix}\right.\)
Ta thấy: \(2n_{H_2}< n_{HCl}\) \(\Rightarrow\) Axit còn dư
b) Theo PTHH: \(n_{HCl\left(p/ứ\right)}=2n_{H_2}=0,3\left(mol\right)\) \(\Rightarrow m_{HCl}=0,3\cdot36,5=10,95\left(g\right)\)
Mặt khác: \(m_{H_2}=0,15\cdot2=0,3\left(g\right)\)
Bảo toàn khối lượng: \(m_{muối}=m_{KL}+m_{HCl\left(p/ứ\right)}-m_{H_2}=18,65\left(g\right)\)
c) PTHH: \(Mg+H_2SO_4\rightarrow MgSO_4+H_2\uparrow\)
\(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\uparrow\)
\(Fe+H_2SO_4\rightarrow FeSO_4+H_2\uparrow\)
Khi 8 gam kim loại p/ứ với HCl dư tạo 0,15 mol H2
\(\Rightarrow\) 8 gam kim loại p/ứ với H2SO4 dư cũng tạo 0,15 mol H2
\(\Rightarrow n_{H_2}=n_{H_2SO_4\left(p/ứ\right)}=0,15\left(mol\right)\)
\(\Rightarrow m_{H_2SO_4\left(p/ứ\right)}=0,15\cdot98=14,7\left(g\right)\)
giúp nha
\(P_1:2K+2H_2O\rightarrow2KOH+H_2\left(1\right)\\ P_2:Fe+2HCl\rightarrow FeCl_2+H_2\left(2\right)\\ 2K+2HCl\rightarrow2KCl+H_2\left(3\right)\)
\(n_{H_2\left(1\right)}=\dfrac{V}{22,4}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\\ n_{HCl}=\dfrac{m}{M}=\dfrac{32,85}{36,5}=0,9\left(mol\right)\)
Theo \(pthh\left(1\right)n_K=2n_{H_2}=2\cdot0,15=0,3\left(mol\right)\)
Theo \(pthh\left(3\right)n_{HCl\left(3\right)}=n_K=0,3\left(mol\right)\)
\(\Rightarrow n_{HCl\left(2\right)}=n_{HCl}-n_{HCl\left(3\right)}=0,9-0,3=0,6\left(mol\right)\)
Theo \(pthh\left(2\right)n_{Fe}=\dfrac{1}{2}n_{HCl\left(2\right)}=\dfrac{1}{2}\cdot0,6=0,3\left(mol\right)\)
\(\Rightarrow m_K=2\cdot n\cdot M=2\cdot0,3\cdot39=23,4\left(g\right)\\ m_{Fe}=n\cdot M=2\cdot0,3\cdot56=33,6\left(g\right)\\ \)
\(\Rightarrow m_{h^2\text{ }X}=m_K+m_{Fe}=23,4+33,6=57\left(g\right)\)