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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
\(\left\{{}\begin{matrix}O_3=48\\O_2=32\end{matrix}\right.40\left\{{}\begin{matrix}nO_3=8\\nO_2=8\end{matrix}\right.\)
\(\dfrac{nO_3}{nO_2}=\dfrac{8}{8}=1\Rightarrow nO_3:nO_2=1:1\)
\(\Rightarrow\%O_3=50\%\\ \%O_2=50\%\)
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
=> \(\left\{{}\begin{matrix}\%V_{N_2}=\dfrac{a}{a+b}.100\%=\dfrac{a}{a+3a}.100\%=25\%\\\%V_{NO}=100\%-25\%=75\%\end{matrix}\right.\)
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 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 :)
\(\%m_{O_2}=\dfrac{32a}{32a+44b}.100\%=\dfrac{32.\dfrac{5}{7}b}{32.\dfrac{5}{7}b+44b}.100\%=34,188\%\)
1)
\(d_{SO_2/kk}=\dfrac{64}{29}\approx2,21\)
\(d_{N_2O/kk}=\dfrac{44}{29}\approx1,52\)
2)
\(d_{N_2/CO_2}=\dfrac{28}{44}\approx0,64\) \(d_{N_2/O_2}=\dfrac{28}{32}=0,875\)
\(d_{H_2/CO_2}=\dfrac{2}{44}\approx0,05\) \(d_{H_2/O_2}=\dfrac{2}{32}=0,0625\)
Câu 1 :
Coi
\(n_{SO_2} = n_{N_2O} = 1\ mol\\ M_{hỗn\ hợp} = \dfrac{64+44}{1+1} = 54(g/mol)\\ \Rightarrow d_{hh/không\ khí} = \dfrac{54}{29} = 1,86\)
Câu 2 :
Coi :
\(n_{N_2} = n_{H_2} = 1\ mol\\ M_{hỗn\ hợp} = \dfrac{28 + 2}{1 + 1} = 15(g/mol)\)
Suy ra :
\(d_{hh/CO_2} = \dfrac{15}{44} = 0,34\\ d_{hh/O_2} = \dfrac{15}{32} = 0,46875\)
Đặt \(\hept{\begin{cases}a\left(mol\right)=n_{H_2}=n_{O_2\left(A\right)}\\2b\left(mol\right)=n_{Cl_2}\\3b\left(mol\right)=n_{O_2\left(B\right)}\end{cases}}\)
\(\overline{M_A}=\frac{2a+16.2a}{a+a}=\frac{34a}{2a}=17g/mol\)
\(\overline{M_B}=\frac{2b.71+3b.16.2}{2b+3b}=\frac{238b}{5b}=47,6g/mol\)
\(\rightarrow d_{A/B}=\frac{17}{47,6}=\frac{5}{14}\approx0,36\)
a) \(\left\{{}\begin{matrix}n_{Cl_2}+n_{O_2}=\dfrac{6,72}{22,4}=0,3\\\overline{M}=\dfrac{71.n_{Cl_2}+32.n_{O_2}}{n_{Cl_2}+n_{O_2}}=2.29=58\end{matrix}\right.\)
=> \(\left\{{}\begin{matrix}n_{Cl_2}=0,2\left(mol\right)\\n_{O_2}=0,1\left(mol\right)\end{matrix}\right.\)
\(\left\{{}\begin{matrix}\%V_{Cl_2}=\dfrac{0,2}{0,3}.100\%=66,67\%\\\%V_{O_2}=\dfrac{0,1}{0,3}.100\%=33,33\%\end{matrix}\right.\)
b) \(\left\{{}\begin{matrix}m_{Cl_2}=0,2.71=14,2\left(g\right)\\m_{O_2}=0,1.32=3,2\left(g\right)\end{matrix}\right.\)
hk hiểu đề
lm j co O3 z bn