Gọi số mol NO, NO₂ lần lượt là a, b

=> \(\dfrac{30a+46b}{a+b}=17.2=34\)

=> 30a + 46b = 34a + 34b

=> 4a = 12b

=> a = 3b

=> \(\left\{{}\begin{matrix}\%V_{NO}=\dfrac{a}{a+b}.100\%=\dfrac{3b}{3b+b}.100\%=\dfrac{3}{4}.100\%=75\%\\V_{NO_2}=100\%-75\%=25\%\end{matrix}\right.\)

Gọi số mol NO và NO₂ lần lượt là a,b (mol)

Ta có: \(\dfrac{30a+46b}{a+b}=17.2\)

=> 30a + 46b = 34a + 34b

=> 4a = 12b => a = 3b

\(\%m_{NO_2}=\dfrac{46b}{30a+46b}.100\%=\dfrac{46b}{90b+46b}.100\%=33,82\%\)

a) 

Dựa vào màu sắc:

+ NO: Chất khí không màu

+ NO₂: Chất khí màu nâu

b)

Gọi số mol NO₂, O₂ là a, b (mol)

\(M=\dfrac{46a+32b}{a+b}=17,75.2=35,5\left(g/mol\right)\)

=> 10,5a = 3,5b

=> 3a = b

\(\left\{{}\begin{matrix}\%V_{NO_2}=\dfrac{a}{a+b}.100\%=\dfrac{a}{a+3a}.100\%=25\%\\\%V_{O_2}=100\%-25\%=75\%\end{matrix}\right.\)

A,Nêu phương pháp nhận biết nhanh hai lọ thủy tinh chứa NO và NO2

Màu  săc khí :

-Khí màu nâu :NO2

-Khí ko màu , hóa nâu trong kk :NO
 

\(Đặt:n_{hh}=1\left(mol\right)\)

\(n_{NO_2}=a\left(mol\right),n_{NO}=b\left(mol\right)\)

\(\Leftrightarrow a+b=1\left(1\right)\)

\(\overline{M}=\dfrac{46a+30b}{a+b}=18.2\cdot2=36.4\)

\(\Leftrightarrow46a+30b=36.4\left(2\right)\)

\(\left(1\right),\left(2\right):a=0.4,b=0.6\)

Tới đây tự tính tiếp nhé !!

Ta có: \(\overline{M}_{hh}=18,2\cdot2=36,4\left(đvC\right)\) 

Theo sơ đồ đường chéo: \(\dfrac{n_{NO_2}}{n_{NO}}=\dfrac{6,4}{9,6}=\dfrac{2}{3}\)

\(\Rightarrow\left\{{}\begin{matrix}\%V_{NO_2}=\dfrac{2}{5}\cdot100\%=40\%\\\%V_{NO}=60\%\end{matrix}\right.\)

Giả sử \(n_{NO_2}=2\left(mol\right)\) \(\Rightarrow n_{NO}=3\left(mol\right)\)

\(\Rightarrow\left\{{}\begin{matrix}\%m_{NO_2}=\dfrac{2\cdot46}{2\cdot46+3\cdot30}\cdot100\%\approx50,55\%\\\%m_{NO}=49,45\%\end{matrix}\right.\)

a) Gọi n_O2 =a (mol); n_O3 = b(mol)

Có: \(\dfrac{32a+48b}{a+b}=20.2=40\)

=> 32a + 48b = 40a + 40b

=> 8a = 8b => a = b

=> \(\left\{{}\begin{matrix}\%V_{O_2}=\dfrac{a}{a+b}.100\%=\dfrac{a}{a+a}.100\%=50\%\\\%V_{O_3}=100\%-50\%=50\%\end{matrix}\right.\)

b) Gọi n_N2 =a (mol); n_NO = b(mol)

Có: \(\dfrac{28a+30b}{a+b}=14,75.2=29,5\)

=> 28a + 30b = 29,5a + 29,5b

=> 1,5a = 0,5b

=> 3a = b

=> \(\left\{{}\begin{matrix}\%V_{N_2}=\dfrac{a}{a+b}.100\%=\dfrac{a}{a+3a}.100\%=25\%\\\%V_{NO}=100\%-25\%=75\%\end{matrix}\right.\)

Gọi số mol O₂, CO₂ là a, b

Có: \(\overline{M}=\dfrac{32a+44b}{a+b}=19,5.2=39\)

=> \(a=\dfrac{5}{7}b\)

=> \(\left\{{}\begin{matrix}\%V_{O_2}=\dfrac{a}{a+b}.100\%=\dfrac{\dfrac{5}{7}b}{\dfrac{5}{7}b+b}.100\%=41,67\%\\\%V_{CO_2}=\dfrac{b}{a+b}.100\%=\dfrac{b}{\dfrac{5}{7}b+b}.100\%=58,33\%\end{matrix}\right.\)

\(\left\{{}\begin{matrix}\%m_{O_2}=\dfrac{32a}{32a+44b}.100\%=34,188\%\\\%m_{CO_2}=\dfrac{44b}{32a+44b}.100\%=65,812\%\end{matrix}\right.\)

\(M_{hh}=19,5.M_{H_2}=19,5.2=39\left(\dfrac{g}{mol}\right)\\ Đặt:a=V_{\dfrac{O_2}{hh}}\\ M_{hh}=39\left(\dfrac{g}{mol}\right)\\ \Leftrightarrow\dfrac{32.a+44.\left(100\%-a\right)}{100\%}=39\\ \Leftrightarrow a=\dfrac{5}{12}\\ \Rightarrow\%V_{\dfrac{O_2}{hh}}=\dfrac{5}{12}.100\%=41,667\%\Rightarrow\%V_{\dfrac{CO_2}{hh}}\approx58,333\%\\ \%m_{\dfrac{O_2}{hh}}=\dfrac{\dfrac{5}{12}.32}{\dfrac{5}{12}.32+\dfrac{7}{12}.44}.100\approx34,188\%\\ \Rightarrow\%m_{\dfrac{CO_2}{hh}}\approx65,812\%\)