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\(a/ CuO+2HCl \to CuCl_2+H_2O\\ b/\\ n_{CuO}=0,125(mol)\\ \to n_{HCl}=0,125.2=0,25(mol)\\ m_{HCl}=0,25.36,5=9,125(g)\\ c/\\ n_{CuO}=n_{CuCl_2}=0,125(mol)\\ CM_{CuCl_2}=\frac{0,125}{0,5}=0,25M\)
a) \(CuO+2HCl\rightarrow CuCl2+H2O\)
b) Ta có: \(n_{CuO}=\dfrac{10}{80}=0,8\left(mol\right)\)
Theo PT: \(n_{HCl}=2nCuO=1,6\left(mol\right)\)
\(\Rightarrow m_{HCl}=1,6.36,5=58,4\left(g\right)\)
c) \(n_{CuCl2}=n_{CuO}=0,8\left(mol\right)\)
\(V_{dd}=\)không đổi \(=500ml=0,5l\)
\(\Rightarrow C_{M\left(CuCl2\right)}=\dfrac{0,8}{0,5}=1,6\left(M\right)\)
PTHH: \(CuO+2HCl\rightarrow CuCl_2+H_2O\)
Ta có: \(n_{CuO}=\dfrac{10}{80}=0,125\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}n_{HCl}=0,25\left(mol\right)\\n_{CuCl_2}=0,125\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}m_{HCl}=0,25\cdot36,5=9,125\left(g\right)\\C_{M_{CuCl_2}}=\dfrac{0,125}{0,5}=0,25\left(M\right)\end{matrix}\right.\)
PTHH: Zn + 2HCL ---> ZnCl2 + H2
a)Theo bài ta có:
nZn=mZn/MZn=13/65=0,2 mol
=> nHCl=2 nZn=2.0,2=0,4 mol
=>mHCl=nHCl.MHCl =0,4 . 36,5=14,6(g)
mdd HCl=D.Vdd=1,14 .200=228(g)
=> C% ddHCl=\(\dfrac{mHCl.100\%}{mddHCl}=\dfrac{14,6.100\%}{228}=6,4\%\)(xấp xỉ)
b) nZnCl2=nZn=0,2 mol
=> mZnCl2= nZnCl2.MZnCl2=0,2 .136=27,7(g)
\(n_{Zn}=\dfrac{13}{65}=0,2\left(mol\right)\)
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
\(n_{Zn}=\dfrac{13}{65}=0.2\left(mol\right)\)
\(Zn+2HCl\rightarrow ZnCl_2+H_2\)
\(0.2........0.4..........0.2.......0.2\)
\(m_{HCl}=0.4\cdot36.5=14.6\left(g\right)\)
\(C\%_{HCl}=\dfrac{14.6}{100}\cdot100\%=14.6\%\)
\(m_{ZnCl_2}=0.2\cdot136=27.2\left(g\right)\)
\(m_{\text{dung dịch sau phản ứng}}=13+100-0.2\cdot2=112.6\left(g\right)\)
\(C\%_{ZnCl_2}=\dfrac{27.2}{112.6}\cdot100\%=24.1\%\)
\(a.MgO+2HCl\rightarrow MgCl_2+H_2O\)
\(b.n_{MgO}=\dfrac{16}{40}=0,04mol\)
\(\rightarrow n_{HCl}=0,04.2=0,08mol\)
\(C_{M_{HCl}}=\dfrac{0,08}{0,15}=0,53M\)
\(c.m_{MgCl_2}=0,04.95=3,8g\)
PTHH: \(Fe+2HCl\rightarrow FeCl_2+H_2\uparrow\)
Ta có: \(n_{H_2}=\dfrac{2,24}{22,4}=0,1\left(mol\right)=n_{Fe}\)
\(\Rightarrow\left\{{}\begin{matrix}n_{HCl}=0,2\left(mol\right)\\\%m_{Fe}=\dfrac{0,1\cdot56}{12}\cdot100\%\approx46,67\%\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}C_{M_{HCl}}=\dfrac{0,2}{0,2}=1\left(M\right)\\\%m_{Cu}=53,33\%\end{matrix}\right.\)
\(Fe+2HCl\rightarrow FeCl_2+H_2\)
Cu không phản ứng
\(nH_2=nFe=\dfrac{2,24}{22,4}=0,1mol\)
\(\rightarrow mFe=0,1.56=5,6gam\)
\(\rightarrow\%mFe=\dfrac{5,6}{12}.100\%=46,\left(6\right)\%\)
\(\rightarrow\%mCu=100\%-46,\left(6\right)\%=53,\left(3\right)\%\)
c)
\(CM_{HCl}=\dfrac{0,1.2}{0,2}=1M\)
cứu tui các bn ơi
\(n_{Mg}=\dfrac{2,4}{24}=0,1\left(mol\right)\)
PTHH:
\(Mg+2HCl\rightarrow MgCl_2+H_2\uparrow\)
0,1 0,2 0,1 0,1
\(b,C_{M\left(MgCl_2\right)}=\dfrac{0,1}{0,2}=0,5\left(M\right)\)
\(C_{M\left(HCl\right)}=\dfrac{0,2}{0,2}=1\left(M\right)\)