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Bài 1:
a) \(n_{CO}=x;n_{H_2S}=y\)
\(M_X=32.0,95=30,4\rightarrow\dfrac{28x+34y}{x+y}=30,4\rightarrow2,4x=3,6y\rightarrow\dfrac{x}{y}=\dfrac{3,6}{2,4}=\dfrac{3}{2}\)
%VCO=\(\dfrac{3}{3+2}.100=60\%\)
%\(V_{H_2S}=\dfrac{2}{3+2}.100=40\%\)
b) \(V_{CO}=12,32.\dfrac{3}{5}=7,392l\)
\(V_{H_2S}=12,32.\dfrac{2}{5}=4,928l\)
-Gọi \(V_{CO_2}=x\left(lít\right)\)
\(\overline{M}=\dfrac{44x+28.7,392+34.4,928}{x+12,32}=9.2=18\)
Giải ra x\(\approx5,9\left(lít\right)\)
Bài 2:\(n_{O_2}=x\left(mol\right)\); \(n_{O_3}=y\left(mol\right)\)
\(\overline{M}=\dfrac{32x+48y}{x+y}=18.2=36\rightarrow4x=12y\rightarrow x=3y\)
Ngoài ra 32x+48y=30
Giải 2 phương trình trên ta được: x=\(\dfrac{5}{8}\) và y=\(\dfrac{5}{24}\)
\(m_{O_2}=32x=32.\dfrac{5}{8}=20\left(gam\right)\)
\(m_{O_3}=30-20=10\left(gam\right)\)
\(M_{hh}=22,4.2=44,8\left(g/mol\right);n_{hh}=\dfrac{5,6}{22,4}=0,25\left(mol\right)\\ \Rightarrow m_{hh}=0,25.44,8=11,2\left(g\right)\)
Đặt \(n_{O_2\left(th\text{ê}m\right)}=a\left(mol\right)\left(a>0\right)\)
\(M_{hh\left(m\text{ới}\right)}=20.2=40\left(g/mol\right)\)
Ta có: \(\left\{{}\begin{matrix}m_{hh\left(m\text{ới}\right)}=11,2+32a\left(g\right)\\n_{hh\left(m\text{ới}\right)}=0,25+a\left(mol\right)\end{matrix}\right.\)
\(\Rightarrow M_{hh\left(m\text{ới}\right)}=\dfrac{11,2+32a}{0,25+a}=40\Leftrightarrow a=0,15\left(mol\right)\left(TM\right)\)
\(\Rightarrow V_{O_2}=0,15.22,4=3,36\left(l\right)\)
\(M_X=2,5.16=40\)(g/mol)
\(\rightarrow\dfrac{V_{CO_2}}{V_{O_2}}=\dfrac{n_{CO_2}}{n_{O_2}}=\dfrac{40-32}{44-40}=2\)
Mà \(V_{CO_2}+V_{O_2}=30\left(L\right)\)
\(\rightarrow V_{CO_2}=20\left(L\right);V_{O_2}=10\left(L\right)\)
\(\rightarrow M_Y=\dfrac{20.44+10.32+32V}{V+20+10}=2,25.16=36\)
\(\rightarrow V=30\left(L\right)\)
a) \(M_X=19.2=38\left(g/mol\right)\)
`=>` \(d_{X/kk}=\dfrac{38}{29}=1,310345\)
b) \(m_X=0,4.38=15,2\left(g\right)\)
Gọi \(\left\{{}\begin{matrix}n_{O_2}=x\left(mol\right)\\n_{CO_2}=y\left(mol\right)\end{matrix}\right.\)
`=>` \(\left\{{}\begin{matrix}32x+44y=15,2\\x+y=0,4\end{matrix}\right.\Leftrightarrow x=y=0,2\)
\(m_Y=0,1.28+15,2=18\left(g\right)\)
`=>` \(\left\{{}\begin{matrix}\%m_{N_2}=\dfrac{0,1.28}{18}.100\%=15,56\%\\\%m_{O_2}=\dfrac{0,2.32}{18}.100\%=35,56\%\\\%m_{CO_2}=100\%-15,56\%-35,56\%=48,88\%\end{matrix}\right.\)
b) \(M_{hh}=4.10=40\left(g/mol\right)\)
Gọi \(n_{NO_2}=a\left(mol\right)\)
`=>` \(\left\{{}\begin{matrix}m_{hh}=18+46a\left(g\right)\\n_{hh}=0,5+0,1+a=0,6+a\left(mol\right)\end{matrix}\right.\)
`=>` \(M_{hh}=\dfrac{m_{hh}}{n_{hh}}=\dfrac{18+46a}{0,6+a}=40\)
`=> a = 1`
`=> V_{NO_2(đktc)} = 1.22,4 = 22,4 (l)`
Tham khảo cách làm nhé!
