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\(n_{Al}=\dfrac{2.7}{27}=0.1\left(mol\right)\)
\(2Al+6HCl\rightarrow2AlCl_3+3H_2\)
\(0.1........0.3.........0.1...........0.15\)
\(m_{dd_{HCl}}=97.8\cdot1=97.8\left(g\right)\)
\(m_{ddsaupư}=2.7+97.8-0.15\cdot2=100.2\left(g\right)\)
\(C\%_{AlCl_3}=\dfrac{0.1\cdot133.5}{100.2}\cdot100\%=13.32\%\)
\(n_{Mg}=\dfrac{4,8}{24}=0,2\left(mol\right)\)
PTHH :
\(Mg+2HCl\rightarrow MgCl_2+H_2\uparrow\)
0,2 0,4 0,2 0,2
\(a,V_{H_2}=0,2.22,4=4,48\left(l\right)\)
\(b,m_{HCl}=0,4.36,5=14,6\left(g\right)\)
\(m_{ddHCl}=\dfrac{14,6.100}{10}=146\left(g\right)\)
\(c,m_{MgCl_2}=0,2.95=19\left(g\right)\)
\(m_{ddMgCl_2}=4,8+146-\left(0,2.2\right)=150,4\left(g\right)\)
\(C\%_{MgCl_2}=\dfrac{19}{150,4}.100\%\approx12,63\%\)
2.
\(n_K=\dfrac{7,8}{39}=0,2\left(mol\right)\)
\(2K+2H_2O\rightarrow2KOH+H_2\uparrow\)
0,2 0,2 0,1
\(m_{KOH}=0,2.56=11,2\left(g\right)\)
\(m_{ddKOH}=7,8+100-\left(0,1.2\right)=107,6\left(g\right)\)
\(C\%=\dfrac{11,2}{107,6}.100\%\approx10,4\%\)
a, PT: \(Zn+H_2SO_4\rightarrow ZnSO_4+H_2\)
\(CuO+H_2SO_4\rightarrow CuSO_4+H_2O\)
b, Ta có: \(n_{H_2}=\dfrac{11,2}{22,4}=0,5\left(mol\right)\)
Theo PT: \(n_{Zn}=n_{H_2}=0,5\left(mol\right)\)
\(\Rightarrow m_{Zn}=0,5.65=32,5\left(g\right)\)
\(\Rightarrow m_{CuO}=72,5-32,5=40\left(g\right)\)
c, Ta có: \(n_{CuO}=\dfrac{40}{80}=0,5\left(mol\right)\)
Theo PT: \(n_{H_2SO_4}=n_{Zn}+n_{CuO}=1\left(mol\right)\)
\(\Rightarrow b=C_{M_{H_2SO_4}}=\dfrac{1}{2,5}=0,4M\)
c, Theo PT: \(\left\{{}\begin{matrix}n_{ZnSO_4}=n_{Zn}=0,5\left(mol\right)\\n_{CuSO_4}=n_{CuO}=0,5\left(mol\right)\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}C_{M_{ZnSO_4}}=\dfrac{0,5}{2,5}=0,2M\\C_{M_{CuSO_4}}=\dfrac{0,5}{2,5}=0,2M\end{matrix}\right.\)
Bạn tham khảo nhé!
a, \(Zn+H_2SO_4\rightarrow ZnSO_4+H_2\left(I\right)\)
\(CuO+H_2SO_4\rightarrow CuSO_4+H_2O\left(II\right)\)
b, Theo PTHH(1) : \(n_{Zn}=n_{H_2}=0,5\left(mol\right)\)
\(\Rightarrow m_{Zn}=32,5\left(g\right)\)
\(\Rightarrow m_{CuO}=m_{hh}-m_{Zn}=40\left(g\right)\)
\(\Rightarrow n_{CuO}=\dfrac{m}{M}=0,5\left(mol\right)\)
c, Theo PTHH (1) và (2) : \(n_{H2SO4}=n_{CuO}+n_{Zn}=1\left(mol\right)\)
\(\Rightarrow C_{MH2SO4}=b=\dfrac{n}{V}=\dfrac{1}{2,5}=0,4M\)
d, ( Chắc là thể tích coi như không đổi )
Thấy sau phản ứng thu được A gồm \(0,5molZnSO_4,0,5molCuSO_4\)
\(\Rightarrow C_{MCuSO4}=C_{MZnSO4}=\dfrac{n}{V}=\dfrac{0,5}{2,5}=0,2M\)
Vậy ...
\(n_{Mg}=\dfrac{4.8}{24}=0.2\left(mol\right)\)
\(Mg+2HCl\rightarrow MgCl_2+H_2\)
\(0.2.....................0.2..........0.2\)
\(V_{H_2}=0.2\cdot22.4=4.48\left(l\right)\)
\(m_{\text{dung dịch sau phản ứng }}=4.8+250-0.2\cdot2=254.4\left(g\right)\)
\(m_{MgCl_2}=0.2\cdot95=19\left(g\right)\)
\(C\%_{MgCl_2}=\dfrac{19}{254.4}\cdot100\%=7.47\%\)
Ta có: \(n_{Mg}=\dfrac{4,8}{24}=0,2\left(mol\right)\)
a, PT: \(Mg+2HCl\rightarrow MgCl_2+H_2\)
____0,2____0,4______0,2____0,2 (mol)
b, \(V_{H_2}=0,2.22,4=4,48\left(l\right)\)
c, Ta có: m dd sau pư = mMg + m dd HCl - mH2 = 4,8 + 250 - 0,2.2 = 254,4 (g)
\(\Rightarrow C\%_{MgCl_2}=\dfrac{0,2.95}{254,4}.100\%\approx7,47\%\)
Bạn tham khảo nhé!
Bài 1:
PTHH: \(Mg+2HCl\rightarrow MgCl_2+H_2\uparrow\)
Ta có: \(n_{Mg}=\dfrac{1}{2}n_{HCl}=\dfrac{1}{2}\cdot0,11\cdot1,5=0,0825\left(mol\right)\)
\(\Rightarrow m_{Mg}=0,0825\cdot24=1,98\left(g\right)\)
Ta có: \(\left\{{}\begin{matrix}n_{HCl}=0,796.0,5=0,398\left(mol\right)\\n_{H_2SO_4}=0,796.0,75=0,597\left(mol\right)\end{matrix}\right.\)
\(n_{H_2}=\dfrac{4,368}{22,4}=0,195\left(mol\right)\)
BTNT H, có: \(n_{HCl}+2n_{H_2SO_4}=2n_{H_2}+2n_{H_2O}\Rightarrow n_{H_2O}=0,601\left(mol\right)\)
Theo ĐLBT KL, có: m hh + m axit = m muối + mH2 + mH2O
⇒ m = m muối = 26,43 + 0,398.36,5 + 0,597.98 - 0,195.2 - 0,601.18 = 88,255 (g)
