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Mình làm mẫu một ý nha:
a, Gọi hh SO2 và H2 là X; O2 và N2 là Y
\(\Rightarrow\left\{{}\begin{matrix}\left\{{}\begin{matrix}m_X=0,02.64+0,5.2=2,28\left(g\right)\\n_X=0,02+0,5=0,52\left(mol\right)\end{matrix}\right.\\\left\{{}\begin{matrix}m_Y=0,2.32+0,5.28=20,4\left(g\right)\\n_Y=0,2+0,5=0,7\left(mol\right)\end{matrix}\right.\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}M_X=\dfrac{2,28}{0,52}=4,4\left(\dfrac{g}{mol}\right)\\M_Y=\dfrac{20,4}{0,7}=29,1\left(\dfrac{g}{mol}\right)\end{matrix}\right.\)
\(\Rightarrow d_{X/Y}\)\(=\dfrac{4,4}{29,1}=0,15\)
bạn cho mình hỏi CH4 nặng hay nhẹ hơn không khí vậy ạ,cách tính sao ạ?
a.
\(m_{Al}=0.5\cdot27=13.5\left(g\right)\)
\(m_{CO_2}=\dfrac{6.72}{22.4}\cdot44=13.2\left(g\right)\)
\(m_{N_2}=\dfrac{5.6}{22.4}\cdot28=7\left(g\right)\)
\(m_{CaCO_3}=0.25\cdot100=25\left(g\right)\)
b.
\(m_{hh}=\dfrac{3.36}{22.4}\cdot2+\dfrac{5.6}{22.4}\cdot28+0.2\cdot44=16.1\left(g\right)\)
N phân tử = 1 mol phân tử
\(\Rightarrow n_{O2}=1mol;n_{N_2}=2mol;n_{CO_2}=1,5mol\)
\(\Rightarrow m_{hh}=1.32+2.28+1,5.44=154g\)
b. \(m_{hh}=0,1.56+0,2.64+0,3.65+0,25.27=44,65g\)
c. \(n_{O_2}=\dfrac{2,24}{22,4}=0,1mol\)
\(n_{H_2}=\dfrac{1,12}{22,4}=0,05mol\)
\(n_{HCl}=\dfrac{6,72}{22,4}=0,3mol\)
\(n_{CO_2}=\dfrac{0,56}{22,4}=0,025mol\)
\(\Rightarrow m_{hh}=0,1.32+0,05.2+0,3.36,5+0,025.44=15,35g\)
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)`
a) Gọi số mol N2, O2 trong 6,72l khí A lần lượt là a, b
=> \(\left\{{}\begin{matrix}28a+32b=8,8\\a+b=\dfrac{6,72}{22,4}=0,3\end{matrix}\right.\)
=> \(\left\{{}\begin{matrix}a=0,2\left(mol\right)\\b=0,1\left(mol\right)\end{matrix}\right.\)
\(\left\{{}\begin{matrix}\%V_{N_2}=\dfrac{0,2}{0,3}.100\%=66,67\%\\\%V_{O_2}=\dfrac{0,1}{0,3}.100\%=33,33\%\end{matrix}\right.\)
\(\left\{{}\begin{matrix}\%m_{N_2}=\dfrac{28.0,2}{8,8}.100\%=63,64\%\\\%m_{O_2}=\dfrac{32.0,1}{8,8}.100\%=36,36\%\end{matrix}\right.\)
b)
\(n_A=0,3\left(mol\right)\)
\(\Rightarrow n_{CO_2}=0,3\left(mol\right)\)
\(\Rightarrow m_{CO_2}=0,3.44=13,2\left(g\right)\)
c) 2,2g A có thể tích là 1,68 lít
=> \(V_{H_2}=1,68\left(l\right)\)
Câu 3:
a, Ta có: \(n_{O_2}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\)
b, Ta có: 0,98 kg = 980 (g)
\(\Rightarrow n_{H_2SO_4}=\dfrac{980}{98}=10\left(mol\right)\)
c, Ta có: \(n_{O_2}=\dfrac{12.10^{22}}{6.10^{23}}=0,2\left(mol\right)\)
Câu 4:
Giả sử: \(\left\{{}\begin{matrix}n_{N_2}=x\left(mol\right)\\n_{O_2}=y\left(mol\right)\end{matrix}\right.\)
\(\Rightarrow\dfrac{x}{y}=\dfrac{2}{1}\Leftrightarrow x-2y=0\left(1\right)\)
Mà: mA = 8,8 (g)
\(\Rightarrow28x+32y=8,8\left(2\right)\)
Từ (1) và (2) \(\Rightarrow\left\{{}\begin{matrix}x=0,2\left(mol\right)\\y=0,1\left(mol\right)\end{matrix}\right.\)
Bạn tham khảo nhé!
a) \(V_{N_2\left(kk\right)}=28.\dfrac{4}{5}=22,4\left(l\right)\)
\(\Rightarrow V_{N_2\left(A\right)}=22,4+11,2=33,6\left(l\right)\)
=> \(\%V_{N2\left(A\right)}=\dfrac{33,6}{5,6+11,2+28}.100=75\%\)
b) Ta có % về thể tích cũng là % về số mol
=> %nN2(A) = 75%
c)\(n_{N_2\left(A\right)}=\dfrac{33,6}{22,4}=1,5\left(mol\right)\)
\(\Rightarrow\%m_{N_2\left(A\right)}=\dfrac{1,5.28}{\dfrac{5,6}{22,4}.17+\dfrac{11,2}{22,4}.28+\dfrac{28}{22,4}.29}.100=77,06\%\)
Giả sử có 1 mol khí Cl2, 2 mol khí O2
a) \(\left\{{}\begin{matrix}\%V_{Cl_2}=\dfrac{1}{1+2}.100\%=33,33\%\\\%V_{O_2}=\dfrac{2}{1+2}.100\%=66,67\%\end{matrix}\right.\)
\(\left\{{}\begin{matrix}\%m_{Cl_2}=\dfrac{1.71}{1.71+2.32}.100\%=52,59\%\\\%m_{O_2}=\dfrac{2.32}{1.71+2.32}.100\%=47,41\%\end{matrix}\right.\)
b) \(\overline{M}=\dfrac{1.71+2.32}{1+2}=45\left(g/mol\right)\)
=> \(d_{A/H_2}=\dfrac{45}{2}=22,5\)
c) \(n_A=\dfrac{6,72}{22,4}=0,3\left(mol\right)\)
=> mA = 0,3.45 = 13,5 (g)
Trong A :
\(n_{CO_2}=n_X=a\left(mol\right)\)
Trong B:
\(n_{N_2}=2b\left(mol\right),n_{CO_2}=3b\left(mol\right)\)
\(n_A=2a=0.1\left(mol\right)\Rightarrow a=0.05\)
\(n_B=5b=0.05\left(mol\right)\Rightarrow b=0.01\)
\(m=0.05\cdot44+0.05\cdot X+0.02\cdot28+0.03\cdot44=4.18\left(g\right)\)
\(\Rightarrow X=2\)
\(X:H_2\)