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\(n_{H_2}=\dfrac{2.24}{22.4}=0.1\left(mol\right)\)
\(Zn+2HCl\rightarrow ZnCl_2+H_2\)
\(0.1.......0.2......................0.1\)
Chất rắn X : Cu
\(m_{Zn}=0.1\cdot65=6.5\left(g\right)\Rightarrow m_{Cu}=19.3-6.5=12.8\left(g\right)\)
\(n_{Cu}=\dfrac{12.8}{64}=0.2\left(mol\right)\)
\(C_{M_{HCl}}=\dfrac{0.2}{0.2}=1\left(M\right)\)
\(2Cu+O_2\underrightarrow{^{^{t^o}}}2CuO\)
\(0.2........0.1\)
\(m_{tăng}=m_{O_2}=0.1\cdot32=3.2\left(g\right)\)
\(a.Al,Ag+H_2SO_4\rightarrow ChỉcóAlphảnứng,chấtrắnsauphảnứnglàAg\\ n_{H_2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\\ 2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\\ TheoPT:n_{Al}=\dfrac{2}{3}n_{H_2}=0,1\left(mol\right)\\ \Rightarrow m_{Al}=0,1.27=2,7\left(g\right)\\ \Rightarrow m_{rắnsaupu}=m_{Ag}=15,4-2,7=12,7\left(g\right)\\ b.\%m_{Al}=\dfrac{2,7}{15,4}.100=17,53\%,\%m_{Ag}=100-17,53=82,47\%\)
PT: \(Zn+2HCl\rightarrow ZnCl_2+H_2\)
Ta có: \(n_{H_2}=\dfrac{0,896}{22,4}=0,04\left(mol\right)\)
Theo PT: \(n_{Zn}=n_{H_2}=0,04\left(mol\right)\Rightarrow m_{Zn}=0,04.65=2,6\left(g\right)\)
⇒ mCu = 9 - 2,6 = 6,4 (g)
\(\Rightarrow\left\{{}\begin{matrix}\%m_{Zn}=\dfrac{2,6}{9}.100\%\approx28,89\%\\\%m_{Cu}\approx71,11\%\end{matrix}\right.\)
\(a,PTHH:Zn+2HCl\to ZnCl_2+H_2\\ \Rightarrow n_{Zn}=n_{H_2}=\dfrac{3,7185}{24,79}=0.,15(mol)\\ \Rightarrow m_{Zn}=0,15.65=9,75(g)\\ \Rightarrow \%_{Zn}=\dfrac{9,75}{10}.100\%=97,5\%\\ \Rightarrow \%_{Cu}=100\%-97,5\%=2,5\%\\ b,n_{HCl}=2n_{H_2}=0,3(mol)\\ \Rightarrow m_{dd_{HCl}}=\dfrac{0,3.36,5}{14\%}=78,21(g)\)
a. B gồm AlCl3
\(b.n_{H_2}=\dfrac{13,44}{22,4}=0,6mol\\ 2Al+6HCl\rightarrow2AlCl_3+3H_2\)
0,4 1,2 0,4 0,6
\(\%m_{Al}=\dfrac{0,4.27}{23,6}\cdot100\%=45,76\%\\ \%m_{Cu}=100\%-45,76=54,24\%\\ c.m_B=m_{AlCl_3}=1,2.133,5=106,2g\)
Câu a vs c làm chưa