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![](https://rs.olm.vn/images/avt/0.png?1311)
Khối lượng mol khí X là
\(d_{\dfrac{x}{H_2}}=\dfrac{M_x}{M_{H_2}}=8,5\Rightarrow M_x=8,5.2=17\left(gmol\right)\)
Khối lượng mol khí Y là
\(d_{\dfrac{x}{y}}=\dfrac{M_X}{M_Y}=\dfrac{17}{M_Y}=0,5\Rightarrow M_Y=17:0,5=34\left(gmol\right)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(M_X=\dfrac{M_{O_2}}{d_{O_2/x}}=\dfrac{32}{2}=16(g/mol)\\ M_Y=\dfrac{M_X}{d_{X/Y}}=\dfrac{16}{8}=2(g/mol)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Khối lượng mol của y:
\(d_Y=0,5.64=32\left(\dfrac{g}{mol}\right)\)
Khí Y là O2
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\%O=\dfrac{16a}{32+16a}\cdot100\%=50\%\)
\(\Rightarrow a=2\)
\(Y:SO_2\)
\(M_X=M_{SO_2}\cdot0.53125=64\cdot0.53125=34\left(\dfrac{g}{mol}\right)\)
\(\Rightarrow A+n=34\)
\(BL:n=2\Rightarrow A=32\)
\(X:H_2S\)
![](https://rs.olm.vn/images/avt/0.png?1311)
BT1 :
Ta có : \(d_{\dfrac{A}{B}}=\dfrac{M_A}{M_B}=1,8\)
\(\rightarrow M_A=1,8.30=54\)
BT2 :
Ta có : \(d_{\dfrac{Y}{SO2}}=\dfrac{M_Y}{M_{SO2}}=0,5\rightarrow M_Y=0,5.64=32\)
mà \(d_{\dfrac{X}{Y}}=\dfrac{M_X}{M_Y}=1,5\rightarrow M_X=1,5.32=48\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Câu 6:
1. \(n_{O_2}=\dfrac{2,470}{24,79}=0,1\left(mol\right)\)
PTHH:
\(4Al+3O_2\rightarrow\left(t^o\right)2Al_2O_3\)
2/15 0,1 1/15
\(m_{Al}=\dfrac{2}{15}.27=3,6\left(g\right)\)
2. Gọi m KCl cần thêm là x
Ta có:
\(15\%=\dfrac{\dfrac{10x.10}{100}+\dfrac{300.25}{100}}{10x+300}\)
\(\Rightarrow x=60\)
Vậy \(m_{ddKCl}=\dfrac{60.100}{10}=600\left(g\right)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Sửa đề: Cho \(65g\) kẽm
\(a,PTHH:Zn+2HCl\to ZnCl_2+H_2\\ b,n_{H_2}=\dfrac{24,79}{24,79}=1(mol)\\ \Rightarrow m_{H_2}=1.2=2(g)\\ \text {Bảo toàn KL}:m_{HCl}=m_{ZnCl_2}+m_{H_2}-m_{Zn}=136+2-65=73(g)\)
\(d_{\dfrac{X}{H_2}}=8,5\\ M_{H_2}=2\\ \Rightarrow M_X=d_{\dfrac{X}{H_2}}.M_{H_2}=8,5.2=17\left(g\right)\)
\(d_{\dfrac{X}{Y}}=0,5\\ \Rightarrow d_{\dfrac{Y}{X}}=2\\ M_X=17\\ \Rightarrow M_Y=d_{\dfrac{Y}{X}}.M_X=2.17=34\left(\dfrac{g}{mol}\right)\)
Ta có: dx/h2 = 8,5
=> Mx = 8,5 . 2 = 17 (g/mol)
dx/y = 0,5
=> My = \(\dfrac{17}{0,5}\) = 34 (g/mol)
Vậy Mx = 17 (g/mol)
My = 34 (g/mol)