Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
a)%mZnO=20% => %mCuO=100% - 20%=80%
b) mZnO=20%.25=5(g)=> nZnO=5/81(mol)
mCuO=25-5=20(g) => nCuO=20/80=0,25(mol)
PTHH: ZnO +2 HCl -> ZnCl2 + H2O
5/81_______10/81___5/81(mol)
CuO +2 HCl -> CuCl2 + H2O
0,25__0,5______0,25(mol)
=> nHCl=10/81 + 0,5=101/162(mol)
=>mHCl= 101/162 . 36,5=7373/324(g)
=> mddHCl= 7373/324 : 15%= 151,708(g)
=> VddHCl= 151,708/1,1=137,916(ml)
MgO + 2HCl -> MgCl2 + H2O
x 2x
Fe2O3 + 6HCl -> 2FeCl3 + 3H2O
y 6y
CuO + 2HCl -> CuCl2 + H2O
z 2z
A--H2 dư----> MgO + H2O
Fe
Cu
Fe2O3 + 3H2 -> 2Fe + 3H2O
ky
CuO + H2 -> Cu + H2O
kz
nH2O=1,62/18=0,09mol
Gọi nMgO=x, nFe2O3=y, nCuO=z (trong 4,8g hh A)
nMgO=Kx, nFe2O3=Ky, nCuO=Kz (trong 0,09mol A)
=> kx+ky+kz =4,8
3ky + kz= 0,09
=> 2ky = kx => 2y=x
40x + 160y +80z=4,8
nHCl=2x+6y+2z=5,84/36,5=0,16
=> x=0,02 => mMgO= 0,8g
y=0,01 mFe2O3=1,6g
z=0,03 mCuO=2,4g
*tk
PTHH: \(ZnO+2HCl\rightarrow ZnCl_2+H_2O\)
\(CuO+2HCl\rightarrow CuCl_2+H_2O\)
Ta có: \(\%m_{ZnO}=20\%\) \(\Rightarrow\%m_{CuO}=80\%\)
Mặt khác: \(\left\{{}\begin{matrix}n_{Zn}=\dfrac{25\cdot20\%}{81}=\dfrac{5}{81}\left(mol\right)\\n_{CuO}=\dfrac{25\cdot80\%}{80}=0,25\left(mol\right)\end{matrix}\right.\)
\(\Rightarrow n_{HCl}=\left(\dfrac{5}{81}+0,25\right)\cdot2=\dfrac{101}{162}\left(mol\right)\)
\(\Rightarrow m_{ddHCl}=\dfrac{\dfrac{101}{162}\cdot36,5}{15\%}\approx151,71\left(g\right)\) \(\Rightarrow V_{ddHCl}=\dfrac{151,71}{1,1}\approx137,92\left(ml\right)\)
a) Phương trình hóa học:
\(CuO+2HCl\rightarrow CuCl_2+H_2O\left(1\right)\)
\(Fe_2O_3+6HCl\rightarrow2FeCl_3+3H_2O\left(2\right)\)
\(n_{HCl}=0,2\times3=0,6\left(mol\right)\)
Gọi số mol Cuo và \(Fe_2O_3\) lần lượt là x và y (mol)
Theo bài ra ta có hệ phương trình:
\(\left\{{}\begin{matrix}80x+160y=20\\2x+6y=0,6\end{matrix}\right.\leftrightarrow\left\{{}\begin{matrix}x=0,15\\y=0,05\end{matrix}\right.\leftrightarrow\)
\(\Rightarrow m_{CuO}=0,15\times80=12\left(g\right)\)
\(\Rightarrow\%_{CuO}=\frac{12}{20}\times100\%=60\%\)
\(\Rightarrow\%_{Fe_2O_3}=100\%-60\%=40\%\)
b) Theo (1): \(n_{CuCl_2}=n_{CuO}=0,15\left(mol\right)\)
\(\Rightarrow m_{CuCl_2}=0,15\times135=20,25\left(g\right)\)
Theo (2): \(n_{FeCl_3}=2n_{Fe_2O_3}=0,1\left(mol\right)\)
\(\Rightarrow m_{FeCl_3}=0,1\times162,5=16,25\left(g\right)\)
\(n_{HCl}=0,4.2=0,8\left(mol\right)\\ Đặt:n_{CuO}=a\left(mol\right);n_{Fe_2O_3}=b\left(mol\right)\left(a,b>0\right)\\CuO+2HCl\rightarrow CuCl_2+H_2O\\ Fe_2O_3+6HCl\rightarrow2FeCl_3+3H_2O \\ \Rightarrow\left\{{}\begin{matrix}80a+160b=24\\2a+6b=0,8\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}a=0,1\\b=0,1\end{matrix}\right.\\ C1:m_{muối}=135a+2.162,5b=135.0,1+325.0,1=46\left(g\right)\\ C2:n_{H_2O}=\dfrac{n_{HCl}}{2}=0,4\left(mol\right)=n_{O\left(trongH_2O\right)}=n_{O\left(trong.oxit\right)}\\ \Rightarrow m_{muối}=m_{CuO,Fe_2O_3}-m_{O\left(trong.oxit\right)}+m_{Cl^-}=24-0,4.16+0,8.35,5=46\left(g\right)\\ b,m_{CuO}=80a=8\left(g\right);m_{Fe_2O_3}=160b=16\left(g\right)\)
Làm vài bài rồi ra sân bay check in đây
CuO+2HCl->CuCl2+H2O
x--------2x
Fe2O3+6HCl->2FeCl3+3H2O
y--------------6y
Ta có :
\(\left\{{}\begin{matrix}56x+160y=24\\2x+6y=0,8\end{matrix}\right.\)
=>\(\left\{{}\begin{matrix}x=0,1\\y=0,1\end{matrix}\right.\)
=>m CuO=0,1.56=5,6g
=>m Fe2O3=0,1.160=16g
-> m muối =0,1.135+0,2.162,5=46g
C2:n H2O=0,4 mol
=>m muối =24-0,4.16+0,8.35,5=46g
\(n_{H2}=\dfrac{1,12}{22,4}=0,05\left(mol\right)\)
Pt : \(Mg+2HCl\rightarrow MgCl_2+H_2|\)
1 2 1 1
0,05 0,1 0,05 0,05
\(MgO+2HCl\rightarrow MgCl_2+H_2O|\)
1 2 1 1
0,2 0,4 0,2
a) \(n_{Mg}=\dfrac{0,05.1}{1}=0,05\left(mol\right)\)
\(m_{Mg}=0,05.24=1,2\left(g\right)\)
\(m_{MgO}=9,2-1,2=8\left(g\right)\)
0/0Mg = \(\dfrac{1,2.100}{9,2}=13,04\)0/0
0/0MgO = \(\dfrac{8.100}{9,2}=86,96\)0/0
b) Có : \(m_{MgO}=8\left(g\right)\)
\(n_{MgO}=\dfrac{8}{40}=0,2\left(mol\right)\)
\(n_{HCl\left(tổng\right)}=0,1+0,4=0,5\left(mol\right)\)
\(m_{HCl}=0,5.36,5=18,25\left(g\right)\)
\(m_{ddHCl}=\dfrac{18,25.100}{14,6}=125\left(g\right)\)
c) \(n_{MgCl2\left(tổng\right)}=0,05+0,2=0,25\left(mol\right)\)
⇒ \(m_{MgCl2}=0,25.95=23,75\left(g\right)\)
\(m_{ddspu}=9,2+125-\left(0,05.2\right)=134,1\left(g\right)\)
\(C_{MgCl2}=\dfrac{23,75.100}{134,1}=17,71\)0/0
Chúc bạn học tốt
a)\(n_{H_2}=\dfrac{1,12}{22,4}=0,05\left(mol\right)\)
PTHH: Mg + 2HCl → MgCl2 + H2
Mol: 0,05 0,1 0,05 0,05
PTHH: MgO + 2HCl → MgCl2 + H2O
Mol: 0,2 0,4 0,2
\(\%m_{Mg}=\dfrac{0,05.24.100\%}{9,2}=13,04\%;\%m_{MgO}=100-13,04=86,96\%\)
\(n_{MgO}=\dfrac{9,2-0,05.24}{40}=0,2\left(mol\right)\)
b,\(m_{HCl}=\left(0,1+0,4\right).36,5=18,25\left(g\right)\)
\(m_{ddHCl}=\dfrac{18,25.100}{14,6}=125\left(g\right)\)
c,mdd sau pứ = 9,2+125-0,05.2 = 134,1 (g)
\(C\%_{ddMgCl_2}=\dfrac{\left(0,05+0,2\right).95.100\%}{134,1}=17,71\%\)
Fe2O3 + 6HCl → 2FeCl3 + 3H2O (1)
CuO + 2HCl → CuCl2 + H2O (2)
a) \(m_{CuO}=20\times20\%=4\left(g\right)\)
\(\Rightarrow m_{Fe_2O_3}=20-4=16\left(g\right)\)
b) \(n_{CuO}=\dfrac{4}{80}=0,05\left(mol\right)\)
\(n_{Fe_2O_3}=\dfrac{16}{160}=0,1\left(mol\right)\)
Theo PT1: \(n_{HCl}=6n_{Fe_2O_3}=6\times0,1=0,6\left(mol\right)\)
Theo PT2: \(n_{HCl}=2n_{CuO}=2\times0,05=0,1\left(mol\right)\)
\(\Rightarrow\Sigma n_{HCl}=0,1+0,6=0,7\left(mol\right)\)
\(\Rightarrow m_{HCl}=0,7\times36,5=25,55\left(g\right)\)
\(\Rightarrow m_{ddHCl}=\dfrac{25,55}{5,475\%}=466,67\left(g\right)\)
c) Dung dịch sau phản ứng gồm: CuCl2 và FeCl3
Theo PT1: \(n_{FeCl_3}=2n_{Fe_2O_3}=2\times0,1=0,2\left(mol\right)\)
\(\Rightarrow m_{FeCl_3}=0,2\times162,5=32,5\left(g\right)\)
Theo PT2: \(n_{CuCl_2}=n_{CuO}=0,05\left(mol\right)\)
\(\Rightarrow m_{CuCl_2}=0,05\times135=6,75\left(g\right)\)
\(\Sigma m_{dd}=20+466,67=486,67\left(g\right)\)
\(\Rightarrow C\%_{FeCl_3}=\dfrac{32,5}{486,67}\times100\%=6,68\%\)
\(C\%_{CuCl_2}=\dfrac{6,75}{486,67}\times100\%=1,39\%\)