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\(n_{Zn}=\dfrac{9,75}{65}=0,15\left(mol\right)\)
PT: \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
a, \(n_{H_2}=n_{Zn}=0,15\left(mol\right)\Rightarrow V_{H_2}=0,15.24,79=3,7185\left(l\right)\)
b, \(n_{HCl}=2n_{Zn}=0,3\left(mol\right)\Rightarrow m_{ddHCl}=\dfrac{0,3.36,5}{25\%}=43,8\left(g\right)\)
c, \(Ba\left(OH\right)_2+2HCl\rightarrow BaCl_2+2H_2O\)
Theo PT: \(n_{Ba\left(OH\right)_2}=\dfrac{1}{2}n_{HCl}=0,15\left(mol\right)\)
\(\Rightarrow V_{Ba\left(OH\right)_2}=\dfrac{0,15}{2,5}=0,06\left(l\right)\)
a) Na2SO3 + 2HCl --> 2NaCl + SO2 + H2O
b) nHCl = 0,2.1 = 0,2 (mol)
Na2SO3 + 2HCl --> 2NaCl + SO2 + H2O
_0,1<------0,2------->0,2----->0,1
mNaCl = 0,2.58,5 = 11,7(g)
VSO2 = 0,1.22,4 = 2,24 (l)
c) mNa2SO3 = 0,1.126 = 12,6 (g)
d) \(C_{M\left(NaCl\right)}=\dfrac{0,2}{0,2}=1M\)
a) CaCO3 + 2HCl --> CaCl2 + CO2 + H2O
b) \(n_{CaCO_3}=\dfrac{10}{100}=0,1\left(mol\right)\)
CaCO3 + 2HCl --> CaCl2 + CO2 + H2O
_0,1---->0,2------->0,1----->0,1
=> mCaCl2 = 0,1.111 = 11,1 (g)
=> VCO2 = 0,1.22,4 = 2,24 (l)
c) \(a=C_{M\left(HCl\right)}=\dfrac{0,2}{0,4}=0,5M\)
d) \(C_{M\left(CaCl_2\right)}=\dfrac{0,1}{0,4}=0,25M\)
a) 2Al+6HCl→→2AlCl3+3H2
b)
nAl=10,8\27=0,4(mol)
nAlCl3=nAl=0,4(mol)
mAlCl3=0,4.133,5=53,4(g)
c)
nH2=3\2nAl=0,6(mol)
VH2=22,4.0,6=13,44(l)
d) n HCl=0,4.6\2=1,2 mol
=>Cm HCl=1,2\0,1=12M
\(n_{Al}=\dfrac{10,8}{27}=0,4\left(mol\right)\)
a) Pt : \(2Al+6HCl\rightarrow2AlCl_3+3H_2|\)
2 6 2 3
0,4 1,2 0,4 0,6
b) \(n_{H2}=\dfrac{0,4.3}{2}=0,6\left(mol\right)\)
\(V_{H2\left(dktc\right)}=0,6.24,79=14,874\left(l\right)\)
c) \(n_{AlCl3}=\dfrac{0,6.2}{3}=0,4\left(mol\right)\)
⇒ \(m_{AlCl3}=0,4.133,5=53,4\left(g\right)\)
d) \(n_{HCl}=\dfrac{0,4.6}{2}=1,2\left(mol\right)\)
100ml = 0,1l
\(C_{M_{ddHCl}}=\dfrac{1,2}{0,1}=12\left(M\right)\)
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
\(m_{ddHCl}=\dfrac{0,1.36,5}{10\%}100\%=36,5\left(g\right)\)
\(m_{ddspu}=3,6+36,5=40,1\left(g\right)\)
\(C\%_{FeCl2}=\dfrac{0,05.127}{40,1}.100\%=15,84\%\)
a, \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
b, \(n_{Zn}=\dfrac{39}{65}=0,6\left(mol\right)\)
Theo PT: \(n_{HCl}=2n_{Zn}=1,2\left(mol\right)\Rightarrow m_{HCl}=1,2.36,5=43,8\left(g\right)\)
c, \(n_{H_2}=n_{Zn}=0,6\left(mol\right)\Rightarrow V_{H_2}=0,6.24,79=14,874\left(l\right)\)
d, - Quỳ tím hóa đỏ do HCl dư.
a, \(n_{Zn}=\dfrac{26}{65}=0,4\left(mol\right)\)
\(n_{HCl}=\dfrac{18,25}{36,5}=0,5\left(mol\right)\)
PT: \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
Xét tỉ lệ: \(\dfrac{0,4}{1}>\dfrac{0,5}{2}\), ta được Zn dư.
Theo PT: \(n_{ZnCl_2}=\dfrac{1}{2}n_{HCl}=0,25\left(mol\right)\Rightarrow m_{ZnCl_2}=0,25.136=34\left(g\right)\)
b, \(m_{ddHCl}=\dfrac{18,25}{20\%}=91,25\left(g\right)\)
c, \(n_{H_2}=\dfrac{1}{2}n_{HCl}=0,25\left(mol\right)\)
PT: \(FeO+H_2\underrightarrow{t^o}Fe+H_2O\)
Theo PT: \(n_{FeO}=n_{H_2}=0,25\left(mol\right)\Rightarrow m_{FeO}=0,25.72=18\left(g\right)\)
PTHH: \(Zn+2HCl\rightarrow ZnCl_2+H_2\uparrow\)
Ta có: \(n_{Zn}=\dfrac{9,75}{65}=0,15\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}n_{HCl}=0,3\left(mol\right)\\n_{ZnCl_2}=0,15\left(mol\right)=n_{H_2}\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}V_{H_2}=0,15\cdot22,4=3,36\left(l\right)\\m_{ZnCl_2}=0,15\cdot136=20,4\left(g\right)\\C_{M_{HCl}}=\dfrac{0,3}{0,2}=1,5\left(M\right)\end{matrix}\right.\)
bạn tính sai mol của HCl rồi nhé :))