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PTHH: \(Zn+2HCl\rightarrow ZnCl_2+H_2\uparrow\)
Ta có: \(n_{Zn}=\dfrac{9,75}{65}=0,15\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}n_{HCl}=0,3\left(mol\right)\\n_{ZnCl_2}=0,15\left(mol\right)=n_{H_2}\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}V_{H_2}=0,15\cdot22,4=3,36\left(l\right)\\m_{ZnCl_2}=0,15\cdot136=20,4\left(g\right)\\C_{M_{HCl}}=\dfrac{0,3}{0,2}=1,5\left(M\right)\end{matrix}\right.\)
\(m_{CH_3COOH}=24\%.150=36\left(g\right)\\ \rightarrow n_{CH_3COOH}=\dfrac{36}{60}=0,6\left(mol\right)\)
PTHH: 2CH3COOH + Na2CO3 ---> 2CH3COONa + CO2 + H2O
0,6 0,3 0,6 0,3
=> VCO2 = 0,3.22,4 = 6,72 (l)
\(m_{Na_2CO_3}=0,3.31,8\left(g\right)\)
=> \(m_{ddNa_2CO_3}=\dfrac{31,8}{21,2\%}=150\left(g\right)\)
mCO2 = 0,3.44 = 13,2 (g)
\(m_{dd}=150+150-13,2=286,8\left(g\right)\)
\(m_{CH_3COONa}=0,3.82=24,6\left(g\right)\\ \rightarrow C\%_{CH_3COONa}=\dfrac{24,6}{286,8}=8,58\%\)
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
\(m_{ddHCl}=\dfrac{0,1.36,5}{10\%}100\%=36,5\left(g\right)\)
\(m_{ddspu}=3,6+36,5=40,1\left(g\right)\)
\(C\%_{FeCl2}=\dfrac{0,05.127}{40,1}.100\%=15,84\%\)
\(Pt: Fe + 2HCl \rightarrow FeCl_2 + H_2\)
\(a.n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right)\)
Theo pt: \(nH_2 = nFe = 0,2 mol\)
\(\Rightarrow V_{H_2}=0,2.22,4=4,48l\)
\(b.n_{FeCl_2}=n_{Fe}=0,2\left(mol\right)\)
\(\Rightarrow m_{FeCl_2}=0,2.127=25.4g\)
\(c.n_{HCl}=2nFe=0,4mol\)
\(C_MHCl=\dfrac{0,4}{0,1}=4M\)
\(a.n_{Mg\left(OH\right)_2}=\dfrac{17,4}{58}=0,3\left(mol\right)\\ Mg\left(OH\right)_2+2HCl\rightarrow MgCl_2+2H_2O\\ n_{HCl}=2n_{Mg\left(OH\right)_2}=0,6\left(mol\right)\\ CM_{HCl}=\dfrac{0,6}{0,2}=3M\\b. n_{Mg\left(OH\right)_2}=n_{MgCl_2}=0,3\left(mol\right)\\ m_{MgCl_2}=0,3.85=25,5\left(g\right)\\c.CM_{MgCl_2}=\dfrac{0,3}{0,2}=1,5M \)
a) \(n_{H_2}=\dfrac{2,24}{22,4}=0,1\left(mol\right)\)
PTHH: Mg + 2HCl --> MgCl2 + H2
_____0,1<-0,2------<0,1<---0,1
=> mMgCl2 = 0,1.95 = 9,5 (g)
b) \(C_{M\left(HCl\right)}=\dfrac{0,2}{0,2}=1M\)
a/ Fe + 2HCl \(\rightarrow\) FeCl2 + H2
nH2 = \(\dfrac{3,36}{22,4}=0,15\left(mol\right)\)
Theo PTHH: nH2 = nFe = 0,15 (mol) \(\Rightarrow m_{Fe}=0,15.56=8,4\left(g\right)\)
\(\Rightarrow m_{Cu}=11-8,4=2,6\left(g\right)\)
\(\Rightarrow\%m_{Fe}=\dfrac{8,4}{11}.100\%\approx76,4\%\)
\(\Rightarrow\%m_{Cu}=100-76,4\approx23,6\%\)
b/ Theo PTHH ta có: nHCl = 2nFe = 2.0,15 = 0,3 (mol)
\(\Rightarrow V_{ddHCl}=\dfrac{0,3}{2}=0,15\left(M\right)\)
c/ mHCl = 36,5 . 0,3 = 10,95(g)
\(\Rightarrow C\%_{HCl}=\dfrac{m_{HCl}}{m_{ddHCl}}.100\%=\dfrac{10,95}{200}.100\%=5,475\%\)
Ahhhhhhhhh....Đổi đơn vị sai rồi....Lm lại nha :((
B1:
Zn + 2HCl -> ZnCl2 + H2
Theo bài ra ta có:
nZn = 13/65 = 0,2 mol
Theo pthh và bài ta có:
nH2 = nZn = 0,2 mol
=> VH2 = 0,2 . 22,4 = 4,48 l
nHCl = 2 . 0,2 = 0,4 mol
=>CM dd HCl = 0,4 / 0,25 = 1,6M
nZnCl2 =nZn = 0,2 mol
=>mZnCl2 = 0,2 . 136 = 27,2 g
Vậy....
B2: (làm lại nha...sorry nhiều...mik quên ko chú ý )
Mg + 2HCl -> MgCl2 + H2
Theo bài ra ta có:
nMg = 7,2/24 = 0,3 mol
Theo pthh và bài ta có:
nH2 = nMg = 0,3 mol
=>VH2 = 0,3 . 22,4 = 6,72 l
nHCl = 2 . 0,3 = 0,6 mol
=>CM dd HCl = 0,6/0,4 = 1,5M
nMgCl2 = nMg = 0,3 mol
=>mMgCl2 = 0,3 . 95 = 28,5 g
Vậy...