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Trong A :
\(n_{CO_2}=n_X=a\left(mol\right)\)
Trong B:
\(n_{N_2}=2b\left(mol\right),n_{CO_2}=3b\left(mol\right)\)
\(n_A=2a=0.1\left(mol\right)\Rightarrow a=0.05\)
\(n_B=5b=0.05\left(mol\right)\Rightarrow b=0.01\)
\(m=0.05\cdot44+0.05\cdot X+0.02\cdot28+0.03\cdot44=4.18\left(g\right)\)
\(\Rightarrow X=2\)
\(X:H_2\)
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.
\(m_{hh}=\dfrac{3.36}{22.4}\cdot2+\dfrac{5.6}{22.4}\cdot28+0.2\cdot44=16.1\left(g\right)\)
\(n_{CO_2}=a\left(mol\right),n_{N_2O}=b\left(mol\right),n_{H_2}=c\left(Mol\right)\)
\(n_A=a+b+c=0.05\left(mol\right)\)
\(\Leftrightarrow44a+44b+44c=2.2\left(1\right)\)
\(m_A=44a+44b+2c=1.78\left(g\right)\left(2\right)\)
\(\Rightarrow c=0.01\)
\(m_B=0.01\cdot2+0.03\cdot X=0.14\left(g\right)\)
\(\Rightarrow X=4\)
\(X:He\)
\(a.\)
\(GS:\)
\(n_{hh}=1\left(mol\right)\)
\(Đặt:n_{N_2}=a\left(mol\right),n_{CO_2}=b\left(mol\right)\)
\(\Rightarrow a+b=1\left(1\right)\)
\(m_A=28a+44b=18\cdot2=36\left(2\right)\)
\(\left(1\right),\left(2\right):\)
\(a=b=0.5\)
\(\%m_{N_2}=\dfrac{0.5\cdot28}{0.5\cdot28+0.5\cdot44}\cdot100\%=38.89\%\)
\(\%m_{CO_2}=61.11\%\)
\(b.\)
\(\dfrac{n_{N_2}}{n_{CO_2}}=\dfrac{0.5}{0.5}=\dfrac{1}{1}\)
\(n_{N_2}=n_{CO_2}=\dfrac{1}{2}\cdot n_A=\dfrac{0.2}{2}=0.1\left(mol\right)\)
\(Đặt:n_{CO_2}=x\left(mol\right)\)
\(\overline{M}=\dfrac{0.1\cdot28+0.1\cdot44+44x}{0.2+x}=20\cdot2=40\left(\dfrac{g}{mol}\right)\)
\(\Rightarrow x=0.2\)
\(m_{CO_2\left(cầnthêm\right)}=0.2\cdot44=8.8\left(g\right)\)
a)
Gọi $n_{CO} = a ; n_{NO} = b$
Ta có :
$28a + 30b = (a + b). $\dfrac{103}{14}.4$
$\Rightarrow \dfrac{10}{7}a = \dfrac{4}{7}b$
$\Rightarrow \dfrac{a}{b} = \dfrac{2}{5}(1)$
b)
$28a + 30b = 20,6(2)$
Từ (1)(2) suy ra a = 0,2 ;b = 0,5
$n_{O_2} = 0,5(mol)$
2CO + O2 \(\xrightarrow{t^o}\) 2CO2
0,2..........0,1............0,2........(mol)
2NO + O2 \(\xrightarrow{t^o}\) 2NO2
0,5.........0,25...........0,5............(mol)
Sau phản ứng, B gồm :
CO2 : 0,2 mol
NO2 : 0,5 mol
O2 dư : 0,5 - 0,25 - 0,1 = 0,15(mol)
$n_{hh} = 0,2 + 0,5 + 0,15 = 0,85\ mol$
$\%n_{CO_2} = \dfrac{0,2}{0,85}.100\% = 23,53\%$
$\%n_{NO_2} = \dfrac{0,5}{0,85} .100\% = 58,82\%$
$\%n_{O_2\ dư} = 17,65\%$
Bảo toàn khối lượng : $m_B = m_A + m_{O_2} = 20,6 + 0,5.32 = 36,6(gam)$
$M_B = \dfrac{36,6}{0,85} = 43,06(g/mol)$
$d_{B/He} = \dfrac{43,06}{4} = 10,765$
a) \(M_A=\dfrac{103}{14}.4=\dfrac{206}{7}\)
Lập sơ đồ đường chéo :
=> \(\dfrac{n_{CO}}{n_{NO}}=\dfrac{30-\dfrac{206}{7}}{\dfrac{206}{7}-28}=\dfrac{2}{5}\)
b)Gọi x, y lần lượt là số mol CO, NO
=> \(\left\{{}\begin{matrix}28x+30y=20,6\\\dfrac{x}{y}=\dfrac{2}{5}\end{matrix}\right.\)
=> \(\left\{{}\begin{matrix}x=0,2\\y=0,5\end{matrix}\right.\)
\(n_{O_2}=\dfrac{11,2}{22,4}=0,5\left(mol\right)\)
2CO + O2 → 2CO2
0,2---->0,1---->0,2
2NO + O2 → 2NO2
0,5---->0,25--->0,5
=> Hỗn hợp khí B gồm : \(\left\{{}\begin{matrix}O_{2\left(dư\right)}=0,5-\left(0,1+0,25\right)=0,15\left(mol\right)\\n_{CO_2}=0,2\left(mol\right)\\n_{NO_2}=0,5\left(mol\right)\end{matrix}\right.\)
=> \(M_B=\dfrac{0,15.32+0,2.44+0,5.46}{0,15+0,2+0,5}=\dfrac{732}{17}\)
dB/He= \(\dfrac{732}{17}:4=\dfrac{183}{17}\approx10,77\)
a, khối lượng của 2,5 mol CuO là:
\(m=n.M=2,5.80=200\left(g\right)\)
b, số mol của 4,48 lít khí CO2 (đktc) là:
\(n=\dfrac{V}{22,4}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\)
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
=> \(V_{H_2}=1,68\left(l\right)\)
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