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\(I,M_{hh}=M_{O_2}.0,3125=32.0,3125=10\left(\dfrac{g}{mol}\right)\\ Đặt:n_{N_2}=a\left(\%\right)\\ \Rightarrow\dfrac{28a+2\left(100\%-a\right)}{100\%}=10\\ \Leftrightarrow a\approx30,769\%=\%n_{N_2}=\%V_{N_2}\\ \Rightarrow\%V_{H_2}\approx69,231\%\\ II,Đặt:n_{N_2\left(thêm\right)}=k\left(mol\right)\\ n_{hh}=\dfrac{29,12}{22,4}=1,3\left(mol\right)\\ M_{hh.khí.mới}=M_{O_2}.0,46875=32.0,46875=15\left(\dfrac{g}{mol}\right)\\ \Leftrightarrow\dfrac{\left(k+0,13.0,30769\right).28+2.0,69231}{k+0,13}=15\\ \Leftrightarrow k=\left(ra.âm\right)\)
Nói chung làm được ý 1, anh thấy ý 2 ra âm. Em xem lại đề nha
Bài 1.
Gọi \(\left\{{}\begin{matrix}n_{N_2}=x\left(mol\right)\\n_{H_2}=y\left(mol\right)\end{matrix}\right.\)
\(\dfrac{d_{N_2,H_2}}{M_{O_2}}=0,3125\Rightarrow d_{N_2,H_2}=0,3125\cdot32=10\)
Sơ đồ chéo:
\(N_2\) 28 8
\(10\)
\(H_2\) 2 18
\(\Rightarrow\dfrac{N_2}{H_2}=\dfrac{x}{y}=\dfrac{8}{18}=\dfrac{4}{9}\)\(\Rightarrow9x-4y=0\left(1\right)\)
Mà \(x+y=\dfrac{29,12}{22,4}=1,3\left(2\right)\)
Từ (1) và (2) \(\Rightarrow\left\{{}\begin{matrix}x=0,4\\y=0,9\end{matrix}\right.\)
\(\%V_{N_2}=\dfrac{0,4}{0,4+0,9}\cdot100\%=30,77\%\)
\(\%V_{H_2}=100\%-30,77\%=69,23\%\)
a) \(\overline{M}_A=5,875.2=11,75\left(g/mol\right)\)
b) Gọi số mol N2, H2 là a, b (mol)
\(\overline{M}_A=\dfrac{28a+2b}{a+b}=11,75\left(g/mol\right)\)
=> 16,25a = 9,75b
=> a = 0,6b
\(\left\{{}\begin{matrix}\%n_{N_2}=\dfrac{a}{a+b}.100\%=\dfrac{0,6b}{0,6b+b}.100\%=37,5\%\\\%n_{H_2}=\dfrac{b}{a+b}.100\%=\dfrac{b}{0,6b+b}.100\%=62,5\%\end{matrix}\right.\)
c)
1 mol hỗn hợp A chứa \(\left\{{}\begin{matrix}n_{N_2}=\dfrac{1.37,5}{100}=0,375\left(mol\right)\\n_{H_2}=\dfrac{1.62,5}{100}=0,625\left(mol\right)\end{matrix}\right.\)
\(\overline{M}_B=\dfrac{0,375.28+0,625.2+17x}{1+x}=6,4.2=12,8\left(g/mol\right)\)
=> x = 0,25 (mol)
\(n_{hhA}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\Rightarrow m_{hhA}=0,2.30=6\left(g\right)\)
\(\Rightarrow\left\{{}\begin{matrix}x+y=0,2\\28x+32y=6\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=0,2-y\\28.\left(0,2-y\right)+32y=6\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=0,1\\y=0,1\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}m_{N_2}=0,1.28=2,8\left(g\right)\\m_{O_2}=6-2,8=3,2\left(g\right)\end{matrix}\right.\)
a)
\(V_{N_2}=\dfrac{17,92.62,5}{100}=11,2\left(l\right)\)
=> \(n_{N_2}=\dfrac{11,2}{22,4}=0,5\left(mol\right)\)
Gọi số mol O2 là a (mol)
=> nX = 2a (mol)
Có: \(2a+a+0,5=\dfrac{17,92}{22,4}=0,8\)
=> a = 0,1 (mol)
\(\overline{M}_A=\dfrac{0,1.32+0,2.M_X+0,5.28}{0,8}=12,875.2=25,75\left(g/mol\right)\)
=> MX = 17 (g/mol)
=> X là NH3
b) \(\left\{{}\begin{matrix}\%m_{N_2}=\dfrac{0,5.28}{0,5.28+0,2.17+0,1.32}.100\%=67,961\%\\\%m_{O_2}=\dfrac{0,1.32}{0,5.28+0,2.17+0,1.32}.100\%=15,54\%\\\%m_{NH_3}=\dfrac{0,2.17}{0,5.28+0,2.17+0,1.32}.100\%=16,505\%\end{matrix}\right.\)
c) \(n_{H_2}=\dfrac{0,4}{2}=0,2\left(mol\right)\)
\(\overline{M}_B=\dfrac{0,5.28+0,2.17+0,1.32+0,4}{0,5+0,2+0,1+0,2}=21\left(g/mol\right)\)
Tính tỉ khối của B với gì vậy bn :) ?
gọi số mol N2 là xmol ,H2 là ymol
n khí = 22,4/22,4=1mol=>x + y =1(1)
theo bài ra hỗn hợp khí có tỉ khối với H2 là 3,6 nên ta có pt
x-4y=0(2)
từ (1) và (2) => x=0,8 mol : y=0,2 mol
=> mN2 = 0,8 * 14=11,2 g , mH2=0,2*2=0,2 g
=> m Khí = 11,2 + 0,4=11,6 g
=>%mN2=11,2*100/11,6=96,55%
=>%mH2=100-96,55=3,45%
1)
Coi \(n_X = 1(mol)\)
Gọi : \(n_{CO_2} = a(mol) ; n_{N_2} = b(mol)\)
Ta có :
\(n_X = a + b = 1(mol)\\ m_X = 44a + 28b = 1.1,225.32(gam)\\ \Rightarrow a = 0,7 ; b = 0,3\)
Vậy :
\(\%V_{CO_2} = \dfrac{0,7}{1}.100\% = 70\%\\ \%V_{N_2} = 100\% - 70\% = 30\%\)
2)
\(n_X = \dfrac{1}{22,4}(mol)\\ \Rightarrow m_X = n.M = \dfrac{1}{22,4}.1,225.32 = 1,75(gam)\)
Có \(\left\{{}\begin{matrix}n_{H_2}+n_{C_2H_2}=\dfrac{17,92}{22,4}=0,8\\\dfrac{2.n_{H_2}+26.n_{C_2H_2}}{n_{H_2}+n_{C_2H_2}}=0,5.28=14\end{matrix}\right.\)
=> \(\left\{{}\begin{matrix}n_{H_2}=0,4\left(mol\right)\\n_{C_2H_2}=0,4\left(mol\right)\end{matrix}\right.\)
\(n_{O_2}=\dfrac{51,2}{32}=1,6\left(mol\right)\)
PTHH: 2H2 + O2 --to--> 2H2O
0,4-->0,2
2C2H2 + 5O2 --to--> 4CO2 + 2H2O
0,4----->1------------>0,8
=> Y chứa \(\left\{{}\begin{matrix}CO_2:0,8\left(mol\right)\\O_{2\left(dư\right)}:0,4\left(mol\right)\end{matrix}\right.\)
=> \(\overline{M}_Y=\dfrac{0,8.44+0,4.32}{0,8+0,4}=40\left(g/mol\right)\)
\(\overline{M}_X=14\left(g/mol\right)\)
=> \(d_{X/Y}=\dfrac{14}{40}=0,35\)
\(a.\)
\(GS:\)
\(n_{hh}=1\left(mol\right)\)
\(Đặt:n_{N_2}=a\left(mol\right),n_{CO_2}=b\left(mol\right)\)
\(\Rightarrow a+b=1\left(1\right)\)
\(m_A=28a+44b=18\cdot2=36\left(2\right)\)
\(\left(1\right),\left(2\right):\)
\(a=b=0.5\)
\(\%m_{N_2}=\dfrac{0.5\cdot28}{0.5\cdot28+0.5\cdot44}\cdot100\%=38.89\%\)
\(\%m_{CO_2}=61.11\%\)
\(b.\)
\(\dfrac{n_{N_2}}{n_{CO_2}}=\dfrac{0.5}{0.5}=\dfrac{1}{1}\)
\(n_{N_2}=n_{CO_2}=\dfrac{1}{2}\cdot n_A=\dfrac{0.2}{2}=0.1\left(mol\right)\)
\(Đặt:n_{CO_2}=x\left(mol\right)\)
\(\overline{M}=\dfrac{0.1\cdot28+0.1\cdot44+44x}{0.2+x}=20\cdot2=40\left(\dfrac{g}{mol}\right)\)
\(\Rightarrow x=0.2\)
\(m_{CO_2\left(cầnthêm\right)}=0.2\cdot44=8.8\left(g\right)\)
a. Ta có: \(\overline{M_{hh}}=\dfrac{28.1+2.3}{1+3}=8,5\left(g\right)\)
=> \(d_{\dfrac{hh}{O_2}}=\dfrac{\overline{M_{hh}}}{M_{O_2}}=\dfrac{8,5}{32}=0,265626\left(lần\right)\)
b. Ta có: \(V_{N_2}=1.22,4=22,4\left(lít\right)\)
\(V_{H_2}=3.22,4=67,2\left(lít\right)\)
=> \(\%_{V_{N_2}}=\dfrac{22,4}{22,4+67,2}.100\%=25\%\)
\(\%_{V_{H_2}}=100\%-25\%=75\%\)
Ta có: \(m_{N_2}=1.28=28\left(g\right)\)
\(m_{H_2}=3.2=6\left(g\right)\)
=> \(\%_{m_{N_2}}=\dfrac{28}{28+6}.100\%=82,35\%\)
\(\%_{m_{H_2}}=100\%-82,35\%=17,65\%\)