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\(a/\\MgO+2HCl \to MgCl_2+H_2O\\ n_{MgO}=\frac{8}{40}=0,2(mol)\\ b/\\ n_{HCl}=0,2.2=0,4(mol)\\ CM_{HCl}=\frac{0,4}{0,2}=2M\)
nHCl=0,3.2=0,6(mol)
a) PTHH: CuO +2 HCl -> CuCl2 + H2O
0,3_______________0,6___0,3(mol)
b) mCuO=0,3.80=24(g)
c) VddCuCl2=VddHCl=0,3(l)
=>CMddCuCl2=0,3/0,3=1(M)
d) m(muối)=0,3.135=40,5(g)
\(a,PTHH:Ca\left(OH\right)_2+2HCl\rightarrow CaCl_2+2H_2O\\ b,n_{Ca\left(OH\right)_2}=\dfrac{7,4}{74}=0,1\left(mol\right)\\ \Rightarrow n_{HCl}=2n_{Ca\left(OH\right)_2}=0,2\left(mol\right)\\ \Rightarrow m_{CT_{HCl}}=0,2\cdot36,5=7,3\left(g\right)\\ \Rightarrow C\%_{HCl}=\dfrac{7,3}{200}\cdot100\%=3,65\%\\ c,CaCl_2+H_2SO_4\rightarrow CaSO_4+2HCl\\ n_{H_2SO_4}=1\cdot0,25=0,25\left(mol\right)\\ n_{CaCl_2}=n_{Ca\left(OH\right)_2}=0,1\left(mol\right)\)
Do đó sau p/ứ H2SO4 dư
\(\Rightarrow n_{CaSO_4}=n_{CaCl_2}=0,1\left(mol\right)\\ \Rightarrow m_{CaSO_4}=0,1\cdot136=13,6\left(g\right)\)
Ca(OH)2+ H2CL-> CaCL2+ H2O
số n của Ca(OH)2 là :
A) nCa(OH)2 =m/M=7,4/74=0,1 mol
ta có nCa(OH)2=nCaCL2=0,1 mol
=>mCaCL2=0,1.111=11,1 gam
B) số mol của HCL là
nHCL=nCa(OH).2=0,1.2=0,2 mol
khối lượng của dung dịch HCL cần dùng
mHCL=n.M=0,2.71=14,2 gam
C)
nồng độ phần trăm là :
C/.=11,1/214,6.100/.=5/.
Bài 6:
\(n_{Fe\left(OH\right)_3}=\dfrac{21,4}{107}=0,2\left(mol\right)\)
PT: \(Fe\left(OH\right)_3+3HCl\rightarrow FeCl_3+3H_2O\)
_______0,2________0,6______0,2 (mol)
a, \(C\%_{HCl}=\dfrac{0,6.36,5}{200}.100\%=10,95\%\)
b, \(C\%_{FeCl_3}=\dfrac{0,2.162,5}{21,4+200}.100\%\approx14,68\%\)
Bài 7:
\(m_{H_2SO_4}=100.9,8\%=9,8\left(g\right)\Rightarrow n_{H_2SO_4}=\dfrac{9,8}{98}=0,1\left(mol\right)\)
PT: \(ZnO+H_2SO_4\rightarrow ZnSO_4+H_2O\)
______0,1______0,1_______0,1 (mol)
a, \(m_{ZnO}=0,1.81=8,1\left(g\right)\)
b, \(C\%_{ZnSO_4}=\dfrac{0,1.161}{8,1+100}.100\%\approx14,89\%\)
\(n_{Zn}=\dfrac{13}{65}=0,2\left(mol\right)\)
a) Pt : \(Zn+2HCl\rightarrow ZnCl_2+H_2|\)
1 2 1 1
0,2 0,4 0,2 0,2
b) \(n_{HCl}=\dfrac{0,2.2}{1}=0,4\left(mol\right)\)
⇒ \(m_{HCl}=0,4.36,5=14,6\left(g\right)\)
\(C_{ddHCl}=\dfrac{14,6.100}{100}=14,6\)0/0
c) \(n_{ZnCl2}=\dfrac{0,4.1}{2}=0,2\left(mol\right)\)
⇒ \(m_{ZnCl2}=0,2.136=27,2\left(g\right)\)
\(m_{ddspu}=13+100-\left(0,2.2\right)=112,6\left(g\right)\)
\(C_{ZnCl2}=\dfrac{27,2.100}{112,6}=24,16\)0/0
Chúc bạn học tốt
\(n_{Zn}=\dfrac{13}{65}=0.2\left(mol\right)\)
\(Zn+2HCl\rightarrow ZnCl_2+H_2\)
\(0.2........0.4..........0.2.......0.2\)
\(m_{HCl}=0.4\cdot36.5=14.6\left(g\right)\)
\(C\%_{HCl}=\dfrac{14.6}{100}\cdot100\%=14.6\%\)
\(m_{ZnCl_2}=0.2\cdot136=27.2\left(g\right)\)
\(m_{\text{dung dịch sau phản ứng}}=13+100-0.2\cdot2=112.6\left(g\right)\)
\(C\%_{ZnCl_2}=\dfrac{27.2}{112.6}\cdot100\%=24.1\%\)
PTHH: \(2KOH+H_2SO_4\rightarrow K_2SO_4+2H_2O\)
Ta có: \(n_{KOH}=0,2\cdot0,5=0,1\left(mol\right)\)
\(\Rightarrow n_{H_2SO_4}=n_{K_2SO_4}=0,05\left(mol\right)\) \(\Rightarrow\left\{{}\begin{matrix}C_{M_{H_2SO_4}}=\dfrac{0,05}{0,1}=0,5\left(M\right)\\C_{M_{K_2SO_4}}=\dfrac{0,05}{0,2+0,1}\approx0,17\left(M\right)\end{matrix}\right.\)
Bài 1 :
200ml = 0,2l
100ml = 0,1l
\(n_{KOH}=0,5.0,2=0,1\left(mol\right)\)
a) Pt : \(2KOH+H_2SO_4\rightarrow K_2SO_4+2H_2O|\)
2 1 1 2
0,1 0,05 0,05
b) \(n_{H2SO4}=\dfrac{0,1.1}{2}=0,05\left(mol\right)\)
\(C_{M_{ddH2SO4}}=\dfrac{0,05}{0,1}=0,5\left(M\right)\)
c) \(n_{K2SO4}=\dfrac{0,05.1}{1}=0,05\left(mol\right)\)
\(V_{ddspu}=0,2+0,1=0,3\left(l\right)\)
\(C_{M_{K2SO4}}=\dfrac{0,05}{0,3}=\dfrac{1}{6}\left(M\right)\)
Chúc bạn học tốt
Bài 9 :
\(n_{CuO}=\dfrac{4}{80}=0,05\left(mol\right)\)
\(CuO+2HCl\rightarrow CuCl_2+H_2O\)
0,05--->0,1-------->0,05
a) \(C_{MddHCl}=\dfrac{0,1}{0,1}=1\left(M\right)\)
b) \(m_{CuCl2}=0,05.135=6,75\left(g\right)\)
c) \(C_{MCuCl2}=\dfrac{0,05}{0,1}0,5\left(M\right)\)
Câu 10 :
\(n_{FeO}=\dfrac{3,6}{72}=0,05\left(mol\right)\)
\(FeO+2HCl\rightarrow FeCl_2+H_2O\)
0,05-->0,1------->0,05
\(m_{ddHCl}=\dfrac{0,1.36,5}{10\%}100\%=36,5\left(g\right)\)
\(m_{ddspu}=3,6+36,5=40,1\left(g\right)\)
\(C\%_{FeCl2}=\dfrac{0,05.127}{40,1}.100\%=15,84\%\)
1.
a, \(n_{CO_2}=\dfrac{1,12}{22,4}=0,05\left(mol\right)\)
PTHH: CO2 + 2NaOH → Na2CO3 + H2O
Mol: 0,05 0,1
b, \(C_{M_{ddNaOH}}=\dfrac{0,1}{0,1}=1M\)
2.
a, \(m_{HCl}=200.7,3\%=14,6\left(g\right)\Rightarrow n_{HCl}=\dfrac{14,6}{36,5}=0,4\left(mol\right)\)
PTHH: CuO + 2HCl → CuCl2 + H2O
Mol: 0,2 0,4 0,2
b,\(m_{CuO}=0,2.80=16\left(g\right)\)
c, \(C\%_{ddCuCl_2}=\dfrac{0,2.135.100\%}{16+200}=12,5\%\)