Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
\(n_{Fe}=\dfrac{8,4}{56}=0,15mol\)
\(m_{CuCl_2}=\dfrac{270\cdot10\%}{100\%}=27g\Rightarrow n_{CuCl_2}=0,2mol\)
\(Fe+CuCl_2\rightarrow FeCl_2+Cu\)
0,15 0,2 0,15 0,15
\(a=m_{Cu}=0,15\cdot64=9,6g\)
\(m_{FeCl_2}=0,15\cdot127=19,05g\)
\(m_{ddFeCl_2}=8,4+270-0,15\cdot64=268,8g\)
\(C\%=\dfrac{19,05}{268,8}\cdot100\%=7,09\%\)
\(n_{FeO}=\dfrac{10.8}{72}=0.15\left(mol\right)\)
\(FeO+2HCl\rightarrow FeCl_2+H_2O\)
\(0.15.......0.3.............0.15\)
\(m_{HCl}=0.3\cdot36.5=10.95\left(g\right)\)
\(C\%HCl=\dfrac{10.95}{100}\cdot100\%=10.95\%\)
\(m_{dd}=10.8+100=110.8\left(g\right)\)
\(m_{FeCl_2}=0.15\cdot127=19.05\left(g\right)\)
\(C\%FeCl_2=\dfrac{19.05}{110.8}\cdot100\%=17.19\%\)
nFeO=10.872=0.15(mol)nFeO=10.872=0.15(mol)
FeO+2HCl→FeCl2+H2OFeO+2HCl→FeCl2+H2O
0.15.......0.3.............0.150.15.......0.3.............0.15
mHCl=0.3⋅36.5=10.95(g)mHCl=0.3⋅36.5=10.95(g)
C%HCl=10.95100⋅100%=10.95%C%HCl=10.95100⋅100%=10.95%
mdd=10.8+100=110.8(g)mdd=10.8+100=110.8(g)
mFeCl2=0.15⋅127=19.05(g)mFeCl2=0.15⋅127=19.05(g)
C%FeCl2=19.05110.8⋅100%=17.19%C%FeCl2=19.05110.8⋅100%=17.19%
a, Gọi \(m_{NaCl\left(thêm\right)}=a\left(g\right)\)
\(m_{NaCl\left(bđ\right)}=5\%.100=5\left(g\right)\\ \Rightarrow C\%_{NaCl}=\dfrac{5+a}{100+a}.100\%=5,5\%\\ \Leftrightarrow a=0,53\left(g\right)\)
b, \(m_{NaCl}=58,5.5,5\%=3,2175\left(g\right)\\ n_{NaCl}=\dfrac{3,2175}{58,5}=0,055\left(mol\right)\)
PTHH: NaCl + AgNO3 ---> AgCl↓ + NaNO3
0,055-->0,055------>0,055---->0,055
\(m_{AgCl}=0,055.143,5=7,8925\left(g\right)\\ m_{ddY}=58,5+200-7,8925=250,6075\left(g\right)\\ \Rightarrow C\%_{NaNO_3}=\dfrac{0,055.85}{250,6075}.100\%=1,87\%\)
\(n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right)\\ a,Fe+2HCl\rightarrow FeCl_2+H_2\\ n_{HCl}=2.0,2=0,4\left(mol\right)\\ b,m_{ddHCl}=\dfrac{0,4.36,5.100}{20}=73\left(g\right)\\ c,n_{H_2}=n_{FeCl_2}=n_{Fe}=0,2\left(mol\right)\\ m_{ddsau}=11,2+73-0,2.2=83,8\left(g\right)\\ C\%_{ddFeCl_2}=\dfrac{0,2.127}{83,8}.100\approx30,31\%\)
Fe+H2SO4->FeSO4+H2
0,15---0,15-----0,15---0,15 mol
n Fe=8,4\56=0,15 mol
=>VH2=0,15.22,4=3,36l
=>m H2SO4=0,15.98=14,7g
=>C% H2SO4=14,7\245 .100=6%
=>m dd muối=8,4+245-0,15.2=253,1g
=>C% muối =0,15.152\253,1 .100=9%
\(n_{NaOH}=\dfrac{200\cdot4\%}{40}=0.2\left(mol\right)\)
\(2NaOH+H_2SO_4\rightarrow Na_2SO_4+H_2O\)
\(0.2..............0.1..............0.1\)
\(V_{dd_{H_2SO_4}}=\dfrac{0.1}{0.2}=0.5\left(l\right)\)
\(m_{Na_2SO_4}=0.1\cdot142=14.2\left(g\right)\)
\(m_{dd}=200+510=710\left(g\right)\)
\(C\%_{Na_2SO_4}=\dfrac{14.2}{710}\cdot100\%=2\%\)
Ta có: mNaOH = 200.4% = 8 (g)
\(\Rightarrow n_{NaOH}=\dfrac{8}{40}=0,2\left(mol\right)\)
PT: \(2NaOH+H_2SO_4\rightarrow Na_2SO_4+2H_2O\)
_____0,2______0,1_______0,1 (mol)
a, \(V_{ddH_2SO_4}=\dfrac{0,1}{0,2}=0,5\left(l\right)\)
b, Chất có trong dd sau pư là Na2SO4.
Ta có: m dd sau pư = m dd NaOH + m dd H2SO4 = 200 + 510 = 710 (g)
\(\Rightarrow C\%_{Na_2SO_4}=\dfrac{0,1.142}{710}.100\%=2\%\)
Bạn tham khảo nhé!
a) \(m_{NaOH}=100.20\%=20\left(g\right)\)
=> \(n_{NaOH}=\dfrac{20}{40}=0,5\left(mol\right)\)
PTHH: \(2NaOH+CuCl_2\rightarrow Cu\left(OH\right)_2\downarrow+2NaCl\)
0,5------->0,25--------->0,25------->0,5
b) \(C\%_{CuCl_2}=\dfrac{0,25.135}{450}.100\%=7,5\%\)
c) mdd sau pư = 100 + 450 - 0,25.98 = 525,5 (g)
=> \(C\%_{NaCl}=\dfrac{0,5.58,5}{525,5}.100\%=5,57\%\)
a) \(2NaOH+CuCl_2\rightarrow2NaCl+Cu\left(OH\right)_2\)
b) \(C\%=\dfrac{m_{ct}}{m_{\text{dd}}}.100\)
\(\Leftrightarrow20=\dfrac{m_{ct}}{100}.100\Leftrightarrow m_{ct}=20\)
\(\Rightarrow n_{NaOH}=\dfrac{20}{23+16+1}=0,5\left(mol\right)\)
+) Theo phương trình hóa học , ta có :
\(2n_{NaOH}=n_{CuCl_2}\Rightarrow n_{CuCl_2}=0,25\left(mol\right)\)
Nồng độ % của dung dịch \(CuCl_2\) là :
\(C\%=\dfrac{0,25.\left(64+35,5.2\right)}{450}.100=7,5\%\)
c) Chịu =)))