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a) Gọi nO2 =a (mol); nO3 = 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 nN2 =a (mol); nNO = 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: \(\overline{M}=\dfrac{32a+44b}{a+b}=19,5.2=39\)
=> \(a=\dfrac{5}{7}b\)
=> \(\left\{{}\begin{matrix}\%V_{O_2}=\dfrac{a}{a+b}.100\%=\dfrac{\dfrac{5}{7}b}{\dfrac{5}{7}b+b}.100\%=41,67\%\\\%V_{CO_2}=\dfrac{b}{a+b}.100\%=\dfrac{b}{\dfrac{5}{7}b+b}.100\%=58,33\%\end{matrix}\right.\)
\(\left\{{}\begin{matrix}\%m_{O_2}=\dfrac{32a}{32a+44b}.100\%=34,188\%\\\%m_{CO_2}=\dfrac{44b}{32a+44b}.100\%=65,812\%\end{matrix}\right.\)
thay a = \(\dfrac{5}{7}b\) thôi bn :)
\(\%m_{O_2}=\dfrac{32a}{32a+44b}.100\%=\dfrac{32.\dfrac{5}{7}b}{32.\dfrac{5}{7}b+44b}.100\%=34,188\%\)
\(n_{hh}=\dfrac{13,44}{22,4}=0,6mol\)
\(\overline{M_x}=24.2=48\)
\(\left\{{}\begin{matrix}SO_2:64\\O_2:32\end{matrix}\right.\) 48 = \(\dfrac{16}{16}=1\)
\(\Rightarrow n_{SO_2=}n_{O_2}=0,3mol\)
1. \(m_{hh}=0,3.64+0,3.32=28,8g\)
2. \(\%V_{SO_2}=\dfrac{0,3.22,4}{13,44}.100\%=50\%\)
\(\Rightarrow\%V_{O_2}=50\%\)
3. \(m_{SO_2}=0,3.64=19,2g\)
\(m_{O_2}=0,3.32=9,6g\)
Áp dụng quy tắc đường chéo:
\(a.\\ \Rightarrow\dfrac{V_{Cl_2}}{V_{O_2}}=\dfrac{15,6}{23,4}=\dfrac{2}{3}\\ \Rightarrow\left\{{}\begin{matrix}\%V_{Cl_2}=40\%\\\%V_{O_2}=60\%\end{matrix}\right.\)
\(b.\)
Ta có: \(\dfrac{n_{Cl_2}}{n_{O_2}}=\dfrac{2}{3}\Leftrightarrow\dfrac{m_{Cl_2}}{m_{O_2}}=\dfrac{71.2}{32.3}=\dfrac{71}{48}\Leftrightarrow48m_{Cl_2}-71m_{O_2}=0\)
Mặt khác: \(m_{Cl_2}+m_{O_2}=5,95\)
\(\Rightarrow\left\{{}\begin{matrix}m_{Cl_2}=3,55\left(g\right)\\m_{O_2}=2,4\left(g\right)\end{matrix}\right.\)
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
\(\left\{{}\begin{matrix}\%V_{NO_2}=\dfrac{a}{a+b}.100\%=\dfrac{a}{a+3a}.100\%=25\%\\\%V_{O_2}=100\%-25\%=75\%\end{matrix}\right.\)
Bài 2:
a) Vì khối lượng mol của N2 và CO đều bằng 28 và lớn hơn khối lượng mol của khí metan CH4 (28>16)
=> \(d_{\dfrac{hhX}{CH_4}}=\dfrac{28}{16}=1,75\)
Hỗn hợp X nhẹ hơn không khí (28<29)
b)
\(M_{C_2H_4}=M_{N_2}=M_{CO}=28\left(\dfrac{g}{mol}\right)\\ \rightarrow M_{hhY}=28\left(\dfrac{g}{mol}\right)\\ d_{\dfrac{Y}{H_2}}=\dfrac{28}{2}=14\)
c) \(\%V_{NO}=100\%-\left(30\%+30\%\right)=40\%\\ \rightarrow\%n_{CH_4}=40\%\\ Vì:\%m_{CH_4}=22,377\%\\ Nên:\dfrac{30\%.16}{40\%.30+30\%.16+30\%.\left(x.14+16\right)}=22,377\%\\ \Leftrightarrow x=-0,03\)
Sao lại âm ta, để xíu anh xem lại như nào nhé.
Bài 1:
\(a.\\ d_{\dfrac{SO_2}{O_2}}=\dfrac{64}{32}=2\\ d_{\dfrac{SO_2}{N_2}}=\dfrac{64}{28}=\dfrac{16}{7}\\ d_{\dfrac{SO_2}{SO_3}}=\dfrac{64}{80}=0,8\\ d_{\dfrac{SO_2}{CO}}=\dfrac{64}{28}=\dfrac{16}{7}\\ d_{\dfrac{SO_2}{N_2O}}=\dfrac{64}{44}=\dfrac{16}{11}\\ d_{\dfrac{SO_2}{NO_2}}=\dfrac{64}{46}=\dfrac{32}{23}\\ b.M_{hhA}=\dfrac{1.64+1.32}{1+1}=48\left(\dfrac{g}{mol}\right)\\ d_{\dfrac{hhA}{O_2}}=\dfrac{48}{32}=1,5\)
Gọi số mol O3 và O2 là a, b (mol)
Có: \(\dfrac{48a+32b}{a+b}=20.2=40\)
=> a = b
=> \(\left\{{}\begin{matrix}\%O_3=\dfrac{a}{a+b}.100\%=50\%\\\%O_2=\dfrac{b}{a+b}.100\%=50\%\end{matrix}\right.\)
MX=20.2=40g/mol
\(\left\{{}\begin{matrix}O_3=48\\O_2=32\end{matrix}\right.40\left\{{}\begin{matrix}nO_3=8\\nO_2=8\end{matrix}\right.\)
\(\dfrac{nO_3}{nO_2}=\dfrac{8}{8}=1\Rightarrow nO_3:nO_2=1:1\)
\(\Rightarrow\%O_3=50\%\\ \%O_2=50\%\)