Đặt \(n_{O_2}=x;n_{CO_2}=y\)

\(n_X=\dfrac{4,48}{22,4}=0,2\left(mol\right)\Leftrightarrow x+y=0,2\) 

Ta có: \(16x+44y=\left(x+y\right).18.2\)

     \(\Leftrightarrow2y=5x\)

     \(\Leftrightarrow\dfrac{y}{5}=\dfrac{x}{2}\)

Mà x+y=0,2

\(\Rightarrow\dfrac{y}{5}=\dfrac{x}{2}=\dfrac{x+y}{5+2}=\dfrac{0,2}{7}=0,0286\)

\(\Rightarrow y=5.0,0286=0,143\left(mol\right);x=0,2-0,143=0,057\left(mol\right)\)

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) \(\left\{{}\begin{matrix}m_{Cl_2}=0,2.71=14,2\left(g\right)\\m_{O_2}=0,1.32=3,2\left(g\right)\end{matrix}\right.\)

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)

=> n_X = 2a (mol)

Có: \(2a+a+0,5=\dfrac{17,92}{22,4}=0,8\)

=> a = 0,1 (mol)

\(\overline{M}_A=\dfrac{0,1.32+0,2.M_X+0,5.28}{0,8}=12,875.2=25,75\left(g/mol\right)\)

=> M_X = 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 :) ?

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) \(n_A=\dfrac{6,72}{22,4}=0,3\left(mol\right)\)

=> m_A = 0,3.45 = 13,5 (g)

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.

mCuO=n.M=2,5.(1.64+1.16)= 200 mol

b.nCO₂=V/22,4=4,48:22,4=0,2 mol

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%

\(a.\)

\(GS:\)

\(n_{hh}=1\left(mol\right)\)

\(Đặt:n_{N_2}=a\left(mol\right),n_{CO_2}=b\left(mol\right)\)

\(\Rightarrow a+b=1\left(1\right)\)

\(m_A=28a+44b=18\cdot2=36\left(2\right)\)

\(\left(1\right),\left(2\right):\)

\(a=b=0.5\)

\(\%m_{N_2}=\dfrac{0.5\cdot28}{0.5\cdot28+0.5\cdot44}\cdot100\%=38.89\%\)

\(\%m_{CO_2}=61.11\%\)

\(b.\)

\(\dfrac{n_{N_2}}{n_{CO_2}}=\dfrac{0.5}{0.5}=\dfrac{1}{1}\)

\(n_{N_2}=n_{CO_2}=\dfrac{1}{2}\cdot n_A=\dfrac{0.2}{2}=0.1\left(mol\right)\)

\(Đặt:n_{CO_2}=x\left(mol\right)\)

\(\overline{M}=\dfrac{0.1\cdot28+0.1\cdot44+44x}{0.2+x}=20\cdot2=40\left(\dfrac{g}{mol}\right)\)

\(\Rightarrow x=0.2\)

\(m_{CO_2\left(cầnthêm\right)}=0.2\cdot44=8.8\left(g\right)\)

\(I,M_{hh}=M_{O_2}.0,3125=32.0,3125=10\left(\dfrac{g}{mol}\right)\\ Đặt:n_{N_2}=a\left(\%\right)\\ \Rightarrow\dfrac{28a+2\left(100\%-a\right)}{100\%}=10\\ \Leftrightarrow a\approx30,769\%=\%n_{N_2}=\%V_{N_2}\\ \Rightarrow\%V_{H_2}\approx69,231\%\\ II,Đặt:n_{N_2\left(thêm\right)}=k\left(mol\right)\\ n_{hh}=\dfrac{29,12}{22,4}=1,3\left(mol\right)\\ M_{hh.khí.mới}=M_{O_2}.0,46875=32.0,46875=15\left(\dfrac{g}{mol}\right)\\ \Leftrightarrow\dfrac{\left(k+0,13.0,30769\right).28+2.0,69231}{k+0,13}=15\\ \Leftrightarrow k=\left(ra.âm\right)\)

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) \(\Rightarrow\left\{{}\begin{matrix}x=0,4\\y=0,9\end{matrix}\right.\)

\(\%V_{N_2}=\dfrac{0,4}{0,4+0,9}\cdot100\%=30,77\%\)

\(\%V_{H_2}=100\%-30,77\%=69,23\%\)

\(n_{hh}=\dfrac{13,44}{22,4}=0,6mol\)

\(\overline{M_x}=24.2=48\)

\(\left\{{}\begin{matrix}SO_2:64\\O_2:32\end{matrix}\right.\)       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. \(m_{SO_2}=0,3.64=19,2g\)

\(m_{O_2}=0,3.32=9,6g\)