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\(n_{Fe}=\dfrac{11.2}{56}=0.2\left(mol\right)\)
\(Fe+H_2SO_4\rightarrow FeSO_4+H_2\)
\(0.2.......0.2......................0.2\)
\(V_{H_2}=0.2\cdot22.4=4.48\left(l\right)\)
\(C\%H_2SO_4=\dfrac{0.2\cdot98\cdot100\%}{200}=9.8\%\)
\(n_{Mg}=\dfrac{2.4}{24}=0.1\left(mol\right)\)
\(Mg+2HCl\rightarrow MgCl_2+H_2\)
\(0.1.......0.2...........0.1........0.1\)
\(m_{dd_{HCl}}=\dfrac{0.2\cdot36.5\cdot100}{14.6}=50\left(g\right)\)
\(V_{H_2}=0.1\cdot22.4=2.24\left(l\right)\)
\(m_{MgCl_2}=0.1\cdot95=9.5\left(g\right)\)
\(m_{\text{dung dịch sau phản ứng}}=2.4+50-0.1\cdot2=52.2\left(g\right)\)
\(C\%_{MgCl_2}=\dfrac{9.5}{52.2}\cdot100\%=18.2\%\)
\(n_{Mg}=\dfrac{4.8}{24}=0.2\left(mol\right)\)
\(Mg+2HCl\rightarrow MgCl_2+H_2\)
\(0.2......................0.2......0.2\)
\(m_{MgCl_2}=0.2\cdot95=19\left(g\right)\)
\(V_{H_2}=0.2\cdot22.4=4.48\left(l\right)\)
a) Mg + 2HCl --> MgCl2 + H2
b) \(n_{Mg}=\dfrac{4,8}{24}=0,2\left(mol\right)\)
Mg + 2HCl --> MgCl2 + H2
0,2--------------->0,2--->0,2
=> mMgCl2 = 0,2.95=19 (g)
c) VH2 = 0,2.22,4 = 4,48(l)
\(n_{H_2}=\dfrac{4,48}{22,4}=0,2mol\)
\(2R+2nHCl\rightarrow2RCl_n+nH_2\)
0,4n 0,2
\(\Rightarrow\overline{M_R}=\dfrac{4,8}{0,4}=12n\)
Chọn n=2\(\Rightarrow M=24đvC\)
Vậy M là magie Mg.
\(n_{Zn}=\dfrac{65}{65}=1\left(mol\right)\)
\(Zn+2HCl\rightarrow ZnCl_2+H_2\uparrow\)
1 1 1
\(b,V_{H_2}=1.22,4=22,4\left(l\right)\)
\(c,m_{ZnCl_2}=1.136=136\left(g\right)\)
\(m_{ddZnCl_2}=65+\left(\dfrac{2.36,5:15}{100}\right)-2\approx549,67\left(g\right)\)
\(C\%_{ZnCl_2}=\dfrac{136}{549,67}.100\%\approx24,74\left(\%\right)\)
\(d,H_2+CuO\underrightarrow{t^o}Cu+H_2O\)
trc p/u 1 0,1875
p/u : 0,1875 0,1875 0,1875
sau: 0,8125 0 0,1875
\(n_{CuO}=\dfrac{15}{80}=0,1875\left(mol\right)\)
\(m_{Cu}=0,1875.64=12\left(g\right)\)
a, \(Mg+2HCl\rightarrow MgCl_2+H_2\)
b, \(n_{Mg}=\dfrac{4,8}{24}=0,2\left(mol\right)\)
Theo PT: \(n_{HCl}=2n_{Mg}=0,4\left(mol\right)\Rightarrow m_{HCl}=0,4.36,5=14,6\left(g\right)\)
c, \(n_{H_2}=n_{Mg}=0,2\left(mol\right)\)
PT: \(CuO+H_2\underrightarrow{t^o}Cu+H_2O\)
Ta có: \(n_{CuO}=\dfrac{24}{80}=0,3\left(mol\right)\)
Xét tỉ lệ: \(\dfrac{0,3}{1}>\dfrac{0,2}{1}\), ta được CuO dư.
Theo PT: \(n_{Cu}=n_{H_2}=0,2\left(mol\right)\Rightarrow m_{Cu}=0,2.64=12,8\left(g\right)\)
\(n_{Mg}=\dfrac{4,8}{24}=0,2\left(mol\right)\\ a,PTHH:Mg+2HCl\rightarrow MgCl_2+H_2\\ n_{HCl}=2.0,2=0,4\left(mol\right);n_{H_2}=n_{Mg}=0,2\left(mol\right)\\ b,m_{HCl}=0,4.36,5=14,6\left(g\right)\\ c,n_{CuO}=\dfrac{24}{80}=0,3\left(mol\right)\\ CuO+H_2\rightarrow\left(t^o\right)Cu+H_2O\\ Vì:\dfrac{0,2}{1}< \dfrac{0,3}{1}\Rightarrow CuOdư\\ n_{Cu}=n_{H_2}=0,2\left(mol\right)\\ m_{Cu}=0,2.64=12,8\left(g\right)\)
a. \(Fe+2HCl\rightarrow FeCl_2+H_2\uparrow\)
\(n_{Fe}=\frac{11,2}{56}=0,2mol\)
b. Theo phương trình \(n_{HCl}=n_{Fe}.2=0,2.2=0,4mol\)
\(\rightarrow V_{ddHCl}=\frac{0,4}{2}=0,2l=200ml\)
c. Theo phương trình \(n_{FeCl_2}=n_{Fe}=0,2mol\)
\(\rightarrow C_{M_{ddFeCl_2}}=\frac{0,2}{0,2}=1M\)
Tính cái gì chứ.
\(n_{Mg}=\dfrac{4,8}{24}=0,2\left(mol\right)\)
a, PTHH: \(Mg+2HCl\rightarrow MgCl_2+H_2\)
b, \(n_{H_2}=n_{Mg}=0,2\left(mol\right)\)
c, \(n_{HCl}=2n_{Mg}=0,4\left(mol\right)\)