Cho 11,2g Fê tác dụng hết 200g dd HCl Tính: a) V thu đc (đktc) b) C% dd axit cần dùng c) m muối sinh ra Fe: 56 H: 56 Cl: 35,5
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
\(a,PTHH:Zn+2HCl\rightarrow ZnCl_2+H_2\)
\(b,n_{Zn}=\dfrac{m}{M}=\dfrac{16,25}{65}=0,25\left(mol\right)\\ Theo.PTHH:n_{HCl}=2.n_{Zn}=2.0,25=0,5\left(mol\right)\\ m_{HCl}=n.M=0,5.36,5=18,25\left(g\right)\)
\(Theo.PTHH:n_{H_2}=n_{Zn}=0,25\left(mol\right)\\ V_{H_2\left(đktc\right)}=n.22,4=0,25.22,4=5,6\left(l\right)\)
a)PTHH: \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
b)Khối lượng Zn:\(m_{Zn}=\dfrac{16,25}{65}=0,25\left(mol\right)\)
Ta có: \(n_{HCl}=2n_{Zn}=0,5\left(mol\right)\)
Khối lượng axit HCl cần dùng là: \(m_{HCl}=0,5.36,5=18,25\left(g\right)\)
c)Theo pt ta có: \(n_{H_2}=n_{Zn}=0,25\left(mol\right)\)
Thể tích H2 là: \(V_{H_2}=n.22,4=0,25.22,4=5,6\left(ml\right)\)
\(n_{Fe}=\dfrac{11.2}{56}=0.2\left(mol\right)\)
a: \(Fe+2HCl\rightarrow FeCl_2+H_2\)
0,2 0,2
b: V=0,2*22,4=4,48(lít)
\(n_{H_2}=\dfrac{37,185}{24,79}=1,5mol\\ Fe+2HCl\rightarrow FeCl_2+H_2\\ n_{Fe}=n_{H_2}=1,5mol\\ m_{Fe}=1,5.56=84g\)
PT: \(Fe+2HCl\rightarrow FeCl_2+H_2\)
Ta có: \(n_{H_2}=\dfrac{37,185}{24,79}=1,5\left(mol\right)\)
Theo PT: \(n_{Fe}=n_{H_2}=1,5\left(mol\right)\)
\(\Rightarrow m_{Fe}=1,5.56=84\left(g\right)\)
PTHH: \(Fe+2HCl\rightarrow FeCl_2+H_2\uparrow\)
\(Fe_2O_3+6HCl\rightarrow2FeCl_3+3H_2O\)
a) Ta có: \(n_{H_2}=\dfrac{4,48}{22,4}=0,2\left(mol\right)=n_{Fe}\)
\(\Rightarrow m_{Fe}=0,2\cdot56=11,2\left(g\right)\) \(\Rightarrow m_{Fe_2O_3}=16\left(g\right)\)
b+c) Ta có: \(\left\{{}\begin{matrix}n_{Fe}=0,2\left(mol\right)\\n_{Fe_2O_3}=\dfrac{16}{160}=0,1\left(mol\right)\end{matrix}\right.\)
\(\Rightarrow n_{HCl}=2n_{Fe}+6n_{Fe_2O_3}=1\left(mol\right)\) \(\Rightarrow m_{ddHCl}=\dfrac{36,5}{20\%}=182,5\left(g\right)\)
Mặt khác: \(n_{FeCl_2}=0,2\left(mol\right)=n_{H_2}=n_{FeCl_3}\) \(\Rightarrow\left\{{}\begin{matrix}m_{FeCl_2}=0,2\cdot127=25,4\left(g\right)\\m_{FeCl_3}=0,2\cdot162,5=32,5\left(g\right)\\m_{H_2}=0,2\cdot2=0,4\left(g\right)\end{matrix}\right.\)
\(\Rightarrow m_{dd}=m_{hhA}+m_{ddHCl}-m_{H_2}=209,3\left(g\right)\)
\(\Rightarrow\left\{{}\begin{matrix}C\%_{FeCl_2}=\dfrac{25,4}{209,3}\cdot100\%\approx12,14\%\\C\%_{FeCl_3}=\dfrac{32,5}{209,3}\cdot100\%\approx15,53\%\end{matrix}\right.\)
\(n_{H2}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\)
Pt : \(Fe+2HCl\rightarrow FeCl_2+H_2|\)
1 2 1 1
0,2 0,4 0,2 0,2
\(Fe_2O_3+6HCl\rightarrow2FeCl_3+3H_2O|\)
1 6 2 3
0,1 0,6 0,2
a) \(n_{Fe}=\dfrac{0,2.1}{1}=0,2\left(mol\right)\)
\(m_{Fe}=0,2.56=11,2\left(g\right)\)
\(m_{Fe2O3}=27,2-11,2=16\left(g\right)\)
b) Có : \(m_{Fe2O3}=16\left(g\right)\)
\(n_{Fe2O3}=\dfrac{16}{160}=0,1\left(mol\right)\)
\(n_{HCl\left(tổng\right)}=0,4+0,6=1\left(mol\right)\)
⇒ \(m_{HCl}=1.36,5=36,5\left(g\right)\)
\(m_{ddHCl}=\dfrac{36,5.100}{20}=182,5\left(g\right)\)
c) \(n_{FeCl2}=\dfrac{0,2.1}{1}=0,2\left(mol\right)\)
⇒ \(m_{FeCl2}=0,2.127=25,4\left(g\right)\)
\(n_{FeCl3}=\dfrac{0,6.2}{6}=0,2\left(mol\right)\)
⇒ \(m_{FeCl3}=0,2.162,5=32,5\left(g\right)\)
\(m_{ddspu}=27,2+182,5-\left(0,2.2\right)=209,3\left(g\right)\)
\(C_{FeCl2}=\dfrac{25,4.100}{209,3}=12,14\)0/0
\(C_{FeCl3}=\dfrac{32,5.100}{209,3}=15,53\)0/0
Chúc bạn học tốt
\(n_{Fe}=\dfrac{2,8}{56}=0,05\left(mol\right)\\ n_{HCl}=\dfrac{400.3,65\%}{36,5}=0,4\left(mol\right)\\ a.Fe+2HCl\rightarrow FeCl_2+H_2\\ Vì:\dfrac{0,05}{1}< \dfrac{0,4}{2}\\ \Rightarrow HCldư\\ b.n_{H_2}=n_{FeCl_2}=n_{Fe}=0,05\left(mol\right)\\ m_{FeCl_2}=127.0,05=6,35\left(g\right)\\ V_{H_2\left(đktc\right)}=0,05.22,4=1,12\left(l\right)\\ c.C\%_{ddHCl\left(đã,dùng\right)}=\dfrac{0,05.2.36,5}{400}.100=0,9125\%\)
Ta có: \(n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right)\)
PT: \(Fe+2HCl\rightarrow FeCl_2+H_2\)
a, Theo PT: \(n_{H_2}=n_{Fe}=0,2\left(mol\right)\Rightarrow V_{H_2}=0,2.22,4=4,48\left(l\right)\)
b, \(n_{HCl}=2n_{Fe}=0,4\left(mol\right)\Rightarrow C\%_{HCl}=\dfrac{0,4.36,5}{200}.100\%=7,3\%\)
c, \(n_{FeCl_2}=n_{Fe}=0,2\left(mol\right)\Rightarrow m_{FeCl_2}=0,2.127=25,4\left(g\right)\)