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\(n_{Fe_3O_4}=0,01\left(mol\right)\\ Fe_3O_4+8HCl\rightarrow2FeCl_3+FeCl_2+4H_2O\\ n_{HCl}=1.1=1\left(mol\right)\\ V\text{ì}:\dfrac{0,01}{1}< \dfrac{0,1}{8}\Rightarrow HCl\text{dư}\\ \Rightarrow\text{dd}X:FeCl_2,FeCl_3,HCl\left(d\text{ư}\right)\\ n_{FeCl_2}=n_{Fe_3O_4}=0,01\left(mol\right)\\ n_{FeCl_3}=0,01.2=0,02\left(mol\right)\\ n_{HCl\left(d\text{ư}\right)}=1-0,01.8=0,92\left(mol\right)\\ V_{\text{dd}X}=V_{\text{dd}HCl}=1\left(l\right)\\ C_{M\text{dd}HCl\left(d\text{ư}\right)}=\dfrac{0,92}{1}=0,92\left(M\right)\\ C_{M\text{dd}FeCl_2}=\dfrac{0,01}{1}=0,01\left(M\right)\\ C_{M\text{dd}FeCl_3}=\dfrac{0,02}{1}=0,02\left(M\right)\)
PTHH: \(Fe_2O_3+HCl\rightarrow FeCl_3+3H_2O\)
\(n_{Fe_2O_3}=\dfrac{8}{160}=0,05\left(mol\right)\)
a, Bảo toàn nguyên tố Fe:
\(n_{FeCl_3}=n_{Fe}=2n_{Fe_2O_3}=2.0,05=0,1\left(mol\right)\)
\(\Rightarrow m_{FeCl_3}=162,5.0,1=16,25\left(g\right)\)
b, Bảo toàn nguyên tố Cl:
\(n_{HCl}=n_{Cl}=3n_{FeCl_3}=3.0,1=0,3\left(mol\right)\)
\(\Rightarrow V_{ddHCl}=\dfrac{n_{HCl}}{C_M}=\dfrac{0,3}{0,5}=0,6\left(l\right)\)
c, \(C_{M_{FeCl_3}}=\dfrac{n_{FeCl_3}}{V_{ddFeCl_3}}=\dfrac{0,1}{0,6}=0,17M\)
Mk gửi bạn nhé
Đáp án:
a. 16,25g
b. 0,6l
c. 0,05M
Giải thích các bước giải:
Fe2O3+6HCl → 2FeCl3 + 3H2O
0,05 0,3 0,1
nFe2O3= 8/160= 0,05 mol
a. mFeCl3= 0,1. 162,5= 16,25g
b. VHCl= 0,3/0,5 = 0,6l
c. CMFeCl3 = 0,1/0,5= 0,05M
\(n_{Fe}=n_{H_2}=0,1\left(mol\right)\)
\(\Rightarrow m_{Fe}=5,6\left(g\right)\)
\(\Rightarrow m_{Fe_2O_3}=16\left(g\right)\)
\(\Rightarrow n_{Fe}=2n_{Fe_2O_3}=0,2\left(mol\right)=n_{FeCl_3}\)
Lại có : \(n_{HCl}=2n_{H_2}+3n_{FeCl_3}=0,8\left(mol\right)\)
\(\Rightarrow m_{ddHCl}=292\left(g\right)\)
\(\Rightarrow V=\dfrac{2920}{11}\left(ml\right)=\dfrac{73}{275}\left(l\right)\)
\(\Rightarrow C_{MFeCl_3}=\dfrac{0,2}{\dfrac{73}{275}}=\dfrac{55}{73}\left(M\right)\)
$a)PTHH:2Al+6HCl\to 2AlCl_3+3H_2$
$n_{H_2}=\dfrac{5,04}{22,4}=0,225(mol)$
$\Rightarrow n_{Al}=0,15(mol)$
$\Rightarrow \%m_{Al}=\dfrac{0,15.27}{9,45}.100\%\approx 42,86\%$
$\Rightarrow \%m_{Cu}=100-42,86=57,14\%$
$b)$ Theo PT: $n_{HCl}=2n_{H_2}=0,45(mol)$
$\Rightarrow C_{M_{HCl}}=\dfrac{0,45.110\%}{0,5}=0,99M$
\(Đặt:n_{Al}=a\left(mol\right),n_{Fe}=b\left(mol\right)\)
\(m_{hh}=27a+56b=8.3\left(g\right)\left(1\right)\)
\(n_{H_2}=\dfrac{5.6}{22.4}=0.25\left(mol\right)\)
\(2Al+6HCl\rightarrow2AlCl_3+3H_2\)
\(Fe+2HCl\rightarrow FeCl_2+H_2\)
\(Tathấy:\)
\(n_{HCl}=2n_{H_2}=2\cdot0.25=0.5\left(mol\right)\)
\(V_{ddHCl}=\dfrac{0.5}{0.2}=2.5\left(l\right)\)
\(n_{H_2}=1.5a+b=0.25\left(mol\right)\left(2\right)\)
\(\left(1\right),\left(2\right):a=b=0.1\)
\(C_{M_{AlCl_3}}=\dfrac{0.1}{2.5}=0.04\left(M\right)\)
\(C_{M_{FeCl_2}}=\dfrac{0.1}{2.5}=0.04\left(M\right)\)
Chúc em học tốt !!!
a, Ta có: \(n_{H_2}=\dfrac{5,6}{22,4}=0,25\left(mol\right)\)
BTNT H, có: \(n_{HCl}=2n_{H_2}=0,5\left(mol\right)\)
\(\Rightarrow V_{HCl}=\dfrac{0,5}{0,2}=2,5\left(l\right)\)
b, Giả sử: \(\left\{{}\begin{matrix}n_{Al}=x\left(mol\right)\\n_{Fe}=y\left(mol\right)\end{matrix}\right.\)
⇒ 27x + 56y = 8,3 (1)
Các quá trình:
\(Al^0\rightarrow Al^{+3}+3e\)
x___________ 3x (mol)
\(Fe^0\rightarrow Fe^{+2}+2e\)
y____________2y (mol)
\(2H^++2e\rightarrow H_2^0\)
______0,5__0,25 (mol)
Theo ĐLBT mol e, có: 3x + 2y = 0,5 (2)
Từ (1) và (2) ⇒ x = y = 0,1 (mol)
BTNT Al và Fe, có: \(\left\{{}\begin{matrix}n_{AlCl_3}=n_{Al}=0,1\left(mol\right)\\n_{FeCl_3}=n_{Fe}=0,1\left(mol\right)\end{matrix}\right.\)
\(\Rightarrow C_{M_{AlCl_3}}=C_{M_{FeCl_3}}=\dfrac{0,1}{2,5}=0,04M\)
Bạn tham khảo nhé!
\(a) n_{Fe_2O_3} = \dfrac{8}{160} = 0,05(mol)\\ Fe_2O_3 + 6HCl \to 2FeCl_3 + 3H_2O\\ n_{FeCl_3} = 2n_{Fe_2O_3} = 0,1(mol)\\ m_{FeCl_3} = 0,1.162,5 = 16,25(gam)\\ b) n_{HCl} = 6n_{Fe_2O_3} = 0,05.6 = 0,3(mol)\\ V_{dd\ HCl} = \dfrac{0,3}{0,5} = 0,6(lít)\\ c) C_{M_{FeCl_3}} = \dfrac{0,1}{0,5} = 0,2M\)
\(n_{KMnO_4}=\frac{15,8}{158}=0,1\left(mol\right)\)
PTHH : \(2KMnO_4+16HCl-->2KCl+2MnCl_2+5Cl_2+8H_2O\) (1)
\(Cl_2+H_2-as->2HCl\) (2)
Có : \(m_{ddHCl}=100\cdot1,05=105\left(g\right)\)
=> \(m_{HCl}=105-97,7=7,3\left(g\right)\)
=> \(n_{HCl}=\frac{7,3}{36,5}=0,2\left(mol\right)\)
BT Clo : \(n_{Cl_2}=\frac{1}{2}n_{HCl}=0,1\left(mol\right)\)
Mà theo lí thuyết : \(n_{Cl_2}=\frac{5}{2}n_{KMnO_4}=0,25\left(mol\right)\)
=> \(H\%=\frac{0,1}{0,25}\cdot100\%=40\%\)
Vì spu nổ thu được hh hai chất khí => \(\hept{\begin{cases}H_2\\HCl\end{cases}}\) (Vì H2 dư)
=> \(n_{hh}=\frac{13,44}{22,4}=0,6\left(mol\right)\)
=> \(n_{H_2\left(spu\right)}=n_{hh}-n_{HCl\left(spu\right)}=0,6-0,2=0,4\left(mol\right)\)
BT Hidro : \(\Sigma_{n_{H2\left(trong.binh\right)}}=n_{H_2\left(spu\right)}+\frac{1}{2}n_{HCl}=0,4+0,1=0,5\left(mol\right)\)
đọc thiếu đề câu a wtf
\(C_{M\left(HCl\right)}=\frac{0,2}{0,1}=2\left(M\right)\)
nKCl = 0,1 . 1 = 0,1 (mol)
nAgNO3 = 0,2 . 1 = 0,2 (mol)
PTHH: AgNO3 + KCl -> AgCl + KNO3
LTL: 0,1 < 0,2 => AgNO3 dư
nAgNO3 (p/ư) = nAgCl = nKNO3 = 0,1 (mol)
nAgNO3 (dư) = 0,2 - 0,1 = 0,1 (mol)
Vdd (sau p/ư) = 0,1 + 0,2 = 0,3 (l)
CMAgNO3 = 0,1/0,3 = 0,33M
CMAgCl = 0,1/0,3 = 0,33M
CMKNO3 = 0,1/0,3 = 0,33M
\(n_{MnO_2}=\dfrac{1,74}{87}=0,02\left(mol\right)\)
nHCl = 2.0,2 = 0,4 (mol)
PTHH: MnO2 + 4HCl -to-> MnCl2 + Cl2 + 2H2O
0,02--->0,08----->0,02
=> \(\left\{{}\begin{matrix}C_{M\left(HCl.dư\right)}=\dfrac{0,4-0,08}{0,2}=1,6M\\C_{M\left(MnCl_2\right)}=\dfrac{0,02}{0,2}=0,1M\end{matrix}\right.\)