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a, \(Fe_2O_3+6HCl\rightarrow2FeCl_3+3H_2O\)
\(FeCl_3+3KOH\rightarrow3KCl+Fe\left(OH\right)_{3\downarrow}\)
\(n_{Fe_2O_3}=\dfrac{16}{160}=0,1\left(mol\right)\)
Theo PT: \(n_{HCl}=6n_{Fe_2O_3}=0,6\left(mol\right)\)
\(\Rightarrow m_{HCl}=0,6.36,5=21,9\left(g\right)\)
b, \(n_{Fe\left(OH\right)_3}=n_{FeCl_3}=2n_{Fe_2O_3}=0,2\left(mol\right)\)
\(\Rightarrow m_{Fe\left(OH\right)_3}=0,2.107=21,4\left(g\right)\)
\(n_{KOH}=3n_{FeCl_3}=0,6\left(mol\right)\)
\(\Rightarrow C_{M_{KOH}}=\dfrac{0,6}{0,2}=3\left(M\right)\)
PTHH: \(CuO+2HCl\rightarrow CuCl_2+H_2O\)
\(CuCl_2+2KOH\rightarrow2KCl+Cu\left(OH\right)_2\downarrow\)
a+b) Ta có: \(n_{CuO}=\dfrac{8}{80}=0,1\left(mol\right)\)
\(\Rightarrow n_{HCl}=0,2\left(mol\right)=n_{KOH}\) \(\Rightarrow\left\{{}\begin{matrix}C\%_{HCl}=\dfrac{0,2\cdot36,5}{300}\cdot100\%\approx2,43\%\\C_{M_{KOH}}=\dfrac{0,2}{0,2}=1\left(M\right)\end{matrix}\right.\)
c) PTHH: \(Cu\left(OH\right)_2\xrightarrow[]{t^o}CuO+H_2O\)
Theo các PTHH: \(n_{CuO\left(lý.thuyết\right)}=n_{Cu\left(OH\right)_2}=n_{Cu}=0,1\left(mol\right)\)
\(\Rightarrow n_{CuO}=0,1\cdot95\%=0,095\left(mol\right)\) \(\Rightarrow m_{CuO}=0,095\cdot80=7,6\left(g\right)\)
200ml = 0,2l
\(n_{CuSO4}=1.0,2=0,2\left(mol\right)\)
a) Pt : \(CuSO_4+2KOH\rightarrow Cu\left(OH\right)_2+K_2SO_4|\)
1 2 1 1
0,2 0,4 0,2 0,2
b) \(n_{KOH}=\dfrac{0,2.2}{1}=0,4\left(mol\right)\)
200ml = 0,2l
\(C_{M_{ddKOH}}=\dfrac{0,4}{0,2}=2\left(M\right)\)
c) \(n_{Cu\left(OH\right)2}=\dfrac{0,4.1}{2}=0,2\left(mol\right)\)
⇒ \(m_{Cu\left(OH\right)2}=0,2.98=19,6\left(g\right)\)
d) \(n_{K2SO4}=\dfrac{0,2.1}{1}=0,2\left(mol\right)\)
\(V_{ddspu}=0,2+0,2=0,4\left(l\right)\)
\(C_{M_{K2SO4}}=\dfrac{0,2}{0,4}=0,5\left(M\right)\)
Chúc bạn học tốt
a, \(Na_2CO_3+2HCl\rightarrow2NaCl+CO_2+H_2O\)
b, \(n_{CO_2}=\dfrac{0,896}{22,4}=0,04\left(mol\right)\)
Theo PT: \(n_{HCl}=2n_{CO_2}=0,08\left(mol\right)\)
\(\Rightarrow C_{M_{HCl}}=\dfrac{0,08}{0,2}=0,4\left(M\right)\)
c, \(n_{Na_2CO_3}=0,04\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}\%m_{Na_2CO_3}=\dfrac{0,04.106}{10}.100\%=42,4\%\\\%m_{NaCl}=57,6\%\end{matrix}\right.\)
Gọi: \(\left\{{}\begin{matrix}n_{FeCl_3}=x\left(mol\right)\\n_{MgCl_2}=y\left(mol\right)\end{matrix}\right.\)
PT: \(FeCl_3+3KOH\rightarrow Fe\left(OH\right)_{3\downarrow}+3KCl\)
______x_________3x_________x (mol)
\(MgCl_2+2KOH\rightarrow Mg\left(OH\right)_{2\downarrow}+2KCl\)
____y_________2y_________y (mol)
Ta có: \(n_{KOH}=0,2.2,5=0,5\left(mol\right)\)
⇒ 3x + 2y = 0,5 (1)
m kết tủa = 16,5 ⇒ 107x + 58y = 16,5 (2)
Từ (1) và (2) ⇒ x = y = 0,1 (mol)
\(\Rightarrow C_{M_{FeCl_3}}=C_{M_{MgCl_2}}=\dfrac{0,1}{0,5}=0,2\left(M\right)\)
\(FeCl_3+3KOH\rightarrow Fe\left(OH\right)_3\downarrow+3KCl\\ MgCl_2+2KOH\rightarrow Mg\left(OH\right)_2\downarrow+2KCl\)
\(n_{KOH}=0,2\cdot2,5=0,5\left(mol\right)\)
Đặt nFeCl₃ trong 500ml X là a mol, nMgCl₂ trong 500ml X là b mol
\(\Rightarrow\left\{{}\begin{matrix}3a+2b=0,5\\107a+58b=16,5\end{matrix}\right.\\ \Leftrightarrow\left\{{}\begin{matrix}a=0,1\\b=0,1\end{matrix}\right.\)
\(\Rightarrow C_MFeCl_3=\dfrac{0,1}{0,5}=0,2\left(M\right)\\ C_MMgCl_2=\dfrac{0,1}{0,5}=0,2\left(M\right)\)
\(n_{Al2O3}=\dfrac{10,2}{102}=0,1\left(mol\right)\)
Pt : \(Al_2O_3+6HCl\rightarrow2AlCl_3+3H_2O|\)
1 6 2 3
0,1 0,6 0,1
a) \(n_{HCl}=\dfrac{0,1.6}{1}=0,6\left(mol\right)\)
\(m_{HCl}=0,6.36,5=21,9\left(g\right)\)
\(m_{ddHCl}=\dfrac{21,9.100}{10}=219\left(g\right)\)
b) \(n_{AlCl3}=\dfrac{0,6.2}{6}=0,2\left(mol\right)\)
⇒ \(m_{AlCl3}=0,2.133,5=26,7\left(g\right)\)
c) \(m_{ddspu}=10,2+219=229,2\left(g\right)\)
\(C_{AlCl3}=\dfrac{26,7.100}{229,2}=11,65\)0/0
Chúc bạn học tốt
nAl2O3=10.2:102=0.1(mol)
PTHH:Al2O3+6HCl->2AlCl3+3H2O
theo pthh:nHCl:nAl2O3=6->nHCl=6*0.1=0.6(mol)
mHCl=0.6*36.5=21.9(g)
mdd HCl=21.9*100:14.6=150(g)
theo pthh:nAlCl3:nAl2O3=2->nAlCl3=0.1*2=0.2(mol)
mAlCl3=0.2*133.5=26.7(g)
mdd sau phản ứng:10.2+150=160.2
a)
$AgNO_3 + HCl \to AgCl + HNO_3$
Theo PTHH :
$n_{AgCl} = n_{HCl} = n_{AgNO_3} = \dfrac{340.10\%}{170} =0,2(mol)$
$m_{dd\ HCl} = \dfrac{0,2.36,5}{7,3\%} = 100(gam)$
b)
$m_{AgCl} = 0,2.143,5 = 28,7(gam)$
c)
$m_{dd\ sau\ pư} = 340 + 100 -28,7 = 411,3(gam)$
$n_{HNO_3} = n_{AgNO_3} = 0,2(mol)$
$\Rightarrow C\%_{HNO_3} = \dfrac{0,2.63}{411,3}.100\% = 3,06\%$
Bài 1
\(a,n_{CuO}=\dfrac{16}{80}=0,2\left(mol\right)\\ CuO+2HCl\xrightarrow[]{}CuCl_2+H_2O\\ n_{CuCl_2}=n_{CuO}=0,2mol\\ m_{CuCl_2}=0,2.135=27\left(g\right)\\ b.n_{HCl}=0,2.2=0,4\left(mol\right)\\ C_{MHCl}=\dfrac{0,4}{0,5}=0,8\left(M\right)\)
Bài 5
\(a,n_{NaOH}=0,2.1=0,2\left(mol\right)\\ 2NaOH+H_2SO_4\xrightarrow[]{}Na_2SO_4+2H_2O\\ n_{H_2SO_4}=0,2:2=0,1\left(mol\right)\\ C_{MH_2SO_4}=\dfrac{0,1}{0,4}=0,25\left(M\right)\\ b,n_{Na_2SO_4}=0,2:2=0,1\left(mol\right)\\ C_{MNa_2SO_4}=\dfrac{0,1}{0,2+0,4}=\dfrac{1}{6}\left(M\right)\\ c,m_{Na_2SO_4}=0,1.142=14,2\left(g\right)\)
\(n_{Fe_2O_3}=\dfrac{16}{160}=0,1\left(mol\right)\)
PT: \(Fe_2O_3+6HCl\rightarrow2FeCl_3+3H_2O\)
a, \(n_{HCl}=6n_{Fe_2O_3}=0,6\left(mol\right)\)
\(\Rightarrow C\%_{HCl}=\dfrac{0,6.36,5}{500}.100\%=4,38\%\)
b, \(n_{FeCl_3}=2n_{Fe_2O_3}=0,2\left(mol\right)\)
PT: \(FeCl_3+3KOH\rightarrow3KCl+Fe\left(OH\right)_{3\downarrow}\)
______0,2_______0,6______________0,2 (mol)
\(\Rightarrow C_{M_{KOH}}=\dfrac{0,6}{0,2}=3\left(M\right)\)
\(m_{Fe\left(OH\right)_3}=0,2.107=21,4\left(g\right)\)