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a, \(Zn+H_2SO_4\rightarrow ZnSO_4+H_2\)
\(Cu+2H_2SO_{4\left(đ\right)}\underrightarrow{t^o}CuSO_4+SO_2+2H_2O\)
b, Ta có: \(n_{H_2}=\dfrac{2,479}{24,79}=0,1\left(mol\right)\)
\(n_{Zn}=n_{H_2}=0,1\left(mol\right)\)
\(n_{SO_2}=\dfrac{2,9748}{24,79}=0,12\left(mol\right)\)
\(n_{Cu}=n_{SO_2}=0,12\left(mol\right)\)
\(\Rightarrow m=m_{Zn}+m_{Cu}=0,1.65+0,12.64=14,18\left(g\right)\)
Có: \(n_{H_2SO_{4\left(đ\right)}}=2n_{SO_2}=0,24\left(mol\right)\Rightarrow x=m_{ddH_2SO_4\left(đ\right)}=\dfrac{0,24.98}{98\%}=24\left(g\right)\)
a) mCu = 3,2 (g)
=> mFe = 6 - 3,2 = 2,8 (g)
\(n_{Fe}=\dfrac{2,8}{56}=0,05\left(mol\right)\)
PTHH: Fe + 2HCl --> FeCl2 + H2
0,05->0,1--->0,05--->0,05
=> V1 = 0,05.22,4 = 1,12 (l)
\(n_{Cu}=\dfrac{3,2}{64}=0,05\left(mol\right)\)
PTHH: 2Fe + 6H2SO4(đ/n) --> Fe2(SO4)3 + 3SO2 + 6H2O
0,05--------------------------------->0,075
Cu + 2H2SO4 --> CuSO4 + SO2 + 2H2O
0,05------------------------>0,05
=> V2 = (0,075 + 0,05).22,4 = 2,8 (l)
b)
nHCl(dư) = 0,5.2 - 0,1 = 0,9 (mol)
=> \(\left\{{}\begin{matrix}C_{M\left(HCl.dư\right)}=\dfrac{0,9}{0,5}=1,8M\\C_{M\left(FeCl_2\right)}=\dfrac{0,05}{0,5}=0,1M\end{matrix}\right.\)
\(n_{H_2}=\dfrac{2,24}{22,4}=0,1(mol)\\ a,Zn+2HCl\to ZnCl_2+H_2\\ b,n_{ZnCl_2}=0,1(mol)\\ \Rightarrow m_{ZnCl_2}=0,1.136=13,6(g)\\ c,n_{Zn}=0,1(mol)\\ \Rightarrow \%_{Zn}=\dfrac{0,1.65}{20}.100\%=32,5\%\\ \Rightarrow \%_{Ag}=100\%-32,5\%=67,5\%\)
Ta có: \(n_{H_2}=\dfrac{2,24}{22,4}=0,1\left(mol\right)\)
PTHH:
\(Fe+H_2SO_4--->FeSO_4+H_2\uparrow\left(1\right)\)
\(Cu+H_2SO_4--\times-->\)
Theo PT(1): \(n_{Fe}=n_{H_2}=0,1\left(mol\right)\)
\(\Rightarrow m_{Fe}=m_{Cu}=0,1.56=5,6\left(g\right)\)
PTHH: \(Cu+2H_2SO_{4_{đặc}}\overset{t^o}{--->}CuSO_4+SO_2\uparrow+2H_2O\left(2\right)\)
Ta có: \(n_{Cu}=\dfrac{5,6}{64}=0,0875\left(mol\right)\)
Theo PT(2): \(n_{SO_2}=n_{Cu}=0,0875\left(mol\right)\)
\(\Rightarrow V_{SO_2}=0,0875.22,4=1,96\left(lít\right)\)
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