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\(a,n_{Fe}=\dfrac{11,2}{56}=0,2(mol)\\ PTHH:Fe+2HCl\to FeCl_2+H_2\\ \Rightarrow n_{HCl}=0,4(mol)\\ \Rightarrow m_{dd_{HCl}}=\dfrac{0,4.36,5}{14,6\%}=100(g)\\ b,n_{H_2}=0,2(mol)\\ \Rightarrow V_{H_2}=0,2.22,4=4,48(l)\\ c,n_{FeCl_2}=0,2(mol)\\ \Rightarrow C\%_{FeCl_2}=\dfrac{0,2.127}{11,2+100-0,2.2}.100\%\approx 22,93\%\)
\(a.n_{CuO}=\dfrac{8}{80}=0,1\left(mol\right)\\ CuO+2HCl\rightarrow CuCl_2+H_2O\\ n_{CuCl_2}=n_{CuO}=0,1\left(mol\right)\\ n_{HCl}=2.0,1=0,2\left(mol\right)\\ m_{CuCl_2}=135.0,1=13,5\left(g\right)\\ b.m_{HCl}=0,2.36,5=7,3\left(g\right)\\ c.C_{MddHCl}=\dfrac{0,2}{0,2}=1\left(M\right)\)
Em chưa biết làm dạng này như nào em? Vì dạng này rất cơ bản em ạ!
PTHH: \(CaCO_3+2HCl\rightarrow CaCl_2+H_2O+CO_2\uparrow\)
a) Ta có: \(n_{CaCO_3}=\dfrac{2,5}{100}=0,025\left(mol\right)\)
\(\Rightarrow n_{HCl}=0,05mol\) \(\Rightarrow m_{ddHCl}=\dfrac{0,05\cdot36,5}{18\%}\approx10,14\left(g\right)\)
b) Theo PTHH: \(n_{CaCl_2}=n_{CO_2}=n_{CaCO_3}=0,025\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}m_{CaCl_2}=0,025\cdot111=2,775\left(g\right)\\m_{CO_2}=0,025\cdot44=1,1\left(g\right)\end{matrix}\right.\)
Mặt khác: \(m_{dd\left(saup/ứ\right)}=m_{Zn}+m_{ddHCl}-m_{CO_2}=11,54\left(g\right)\)
\(\Rightarrow C\%_{CaCl_2}=\dfrac{2,775}{11,54}\cdot100\%\approx24,05\%\)
CaCO3+2HCl→CaCl2+CO2↑ +H2O
\(+n_{CaCO_3}=\dfrac{2,5}{100}=0,025\left(mol\right)\)
\(+n_{HCl}=2n_{CaCO_3}=0,05\left(mol\right)\)
\(+m_{HCl}=0,05.98=4,9\left(gam\right)\)
\(+m_{dungdịchHCl}=\dfrac{4,9}{18}.100\%=27,2\left(gam\right)\)
\(+n_{CaCl}=n_{CaCO_3}=0,025\left(mol\right)\)
\(+m_{CaCl_2}=0,025.111=2,775\left(gam\right)\)
Theo ĐLBTKL ta có:
\(m_{CaCl_2}=2,5+27,2-0,025.44-0,025.18=28,15\left(gam\right)\)
C%=\(\dfrac{2,775}{28,15}.100\%\approx9,85\%\)
a,\(n_{CO_2}=\dfrac{2,24}{22,4}=0,1\left(mol\right)\)
PTHH: CaCO3 + 2HCl → CaCl2 + CO2 + H2O
Mol: 0,1 0,2 0,1
\(m_{CaCO_3}=0,1.100=10\left(g\right)\)
b,\(C\%_{ddHCl}=\dfrac{0,2.36,5.100\%}{150}=4,87\%\)
c,mdd sau pứ= 10+150-0,1.44 = 151,2 (g)
\(C\%_{ddCaCl_2}=\dfrac{0,1.111.100\%}{151,2}=7,34\%\)
Ta có: \(n_{H_2}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\)
a. PTHH: \(Mg+2HCl--->MgCl_2+H_2\)
Theo PT: \(n_{Mg}=n_{H_2}=0,2\left(mol\right)\)
=> \(m_{Mg}=0,2.24=4,8\left(g\right)\)
Theo PT: \(n_{HCl}=2.n_{Mg}=2.0,2=0,4\left(mol\right)\)
=> \(m_{HCl}=0,4.36.5=14,6\left(g\right)\)
=> \(C_{\%_{HCl}}=\dfrac{14,6}{200}.100\%=7,3\%\)
b. Ta có: \(m_{dd_{MgCl_2}}=4,8+200=204,8\left(g\right)\)
Theo PT: \(n_{MgCl_2}=n_{Mg}=0,2\left(mol\right)\)
=> \(m_{MgCl_2}=0,2.95=19\left(g\right)\)
=> \(C_{\%_{MgCl_2}}=\dfrac{19}{204,8}.100\%=9,28\%\)
\(n_{Fe_2O_3}=0,2(mol)\\ Fe_2O_3+6HCl \to 2FeCl_3+3H_2O\\ n_{HCl}=1,2(mol)\\ V_{ddHCl}=\frac{250}{1,25}=200(ml)=0,2(l)\\ CM_{HCl}=\frac{1,2}{0,2}=6M$\)
a) PTHH: \(Fe+2HCl\rightarrow FeCl_2+H_2\uparrow\)
a_____2a______a_____a (mol)
\(2Al+6HCl\rightarrow2AlCl_3+3H_2\uparrow\)
b_____3b_______b_____\(\dfrac{3}{2}\)b (mol)
Ta lập HPT: \(\left\{{}\begin{matrix}56a+27b=36,1\\a+\dfrac{3}{2}b=\dfrac{21,28}{22,4}=0,95\end{matrix}\right.\) \(\Leftrightarrow\left\{{}\begin{matrix}a=0,5\\b=0,3\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}m_{Fe}=0,5\cdot56=28\left(g\right)\\m_{Al}=8,1\left(g\right)\end{matrix}\right.\)
b+c) Theo các PTHH: \(\left\{{}\begin{matrix}n_{HCl}=2a+3b=1,9\left(mol\right)\\n_{FeCl_2}=0,5\left(mol\right)\\n_{AlCl_3}=0,3\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}C_{M_{HCl}}=\dfrac{1,9}{0,2}=9,5\left(M\right)\\C_{M_{FeCl_2}}=\dfrac{0,5}{0,2}=2,5\left(M\right)\\C_{M_{AlCl_3}}=\dfrac{0,3}{0,2}=1,5\left(M\right)\end{matrix}\right.\)
Bài 1: a) \(n_{Fe_2O_3}=\dfrac{16}{160}=0,1\left(mol\right)\)
\(Fe_2O_3+6HCl\rightarrow2FeCl_3+3H_2O\)
Theo PT: \(n_{HCl}=6n_{Fe_2O_3}=0,6\left(mol\right)\)
=> \(m_{ddHCl}=\dfrac{0,6.36,5}{14,6\%}=150\left(g\right)\)
b) \(n_{FeCl_3}=2n_{Fe_2O_3}=0,2\left(mol\right)\)
=> \(m_{FeCl_3}=0,2.162,5=32,5\left(g\right)\)
a) \(Mg+H_2SO_4\rightarrow MgSO_4+H_2\)
Theo PT: \(n_{H_2}=n_{H_2SO_4}=\dfrac{4,9\%.100}{98}=0,05\left(mol\right)\)
=> \(V_{H_2}=0,05.22,4=1,12\left(l\right)\)
b)Theo PT: \(n_{Mg}=n_{H_2SO_4}=0,05\left(mol\right)\)
=> \(m_{Mg}=0,05.24=1,2\left(g\right)\)