a.

\(d_{A\text{/}O_2}=1.375\) \(\Rightarrow M_A=1.375\cdot32=44\left(g\text{/}mol\right)\)

b.

\(d_{B\text{/}kk}=0.586\) \(\Rightarrow M_B=0.586\cdot29=17\left(g\text{/}mol\right)\)

1)

$M_X = 1,375.32  = 44(g/mol)$
$M_X = 0,0625.32 = 2(g/mol)$

2)

$M_X = 2,207.29 = 64(g/mol)$

$M_X = 1,172.29 = 34(g/mol)$

3)

$M_X = 17.2 = 34(g/mol)$

Vậy khí X là $H_2S$

4)

a) $M_X = 0,552.29 = 16$
Gọi CTHH của X là $C_xH_y$

Ta có :  $\dfrac{12x}{75} = \dfrac{y}{25} = \dfrac{16}{100}$

Suy ra:  x = 1 ; y = 4

Vậy X là $CH_4$

$CH_4 + 2O_2 \xrightarrow{t^o} CO_ 2+ 2H_2O$
$V_{O_2} = 2V_{CH_4} = 11,2.2 = 22,4(lít)$

$M_A = 1,517.29 = 44(đvC)$

$M_B = 1,0625.M_{O_2} = 1,0625.32 = 349(đvC)$

d_A/O2 =M_A/32 =0,5

M_A= 0,5.32 = 16

d_B/A= 2,125

M_B = 2,125.16 = 34

\(d_{B/O_2}=\dfrac{M_B}{M_{O_2}}=\dfrac{M_B}{32}=0,5=>M_B=0,5.32=16\)

\(d_{A/B}=\dfrac{M_A}{M_B}=\dfrac{M_A}{M_B}=\dfrac{M_A}{16}=2,125=>M_A=2,125.16=34\)

Chúc bạn học tốt

bn tách nhỏ từng bài ra

Anh có làm rồi em hi

\(a,d_{\dfrac{N_2}{O_2}}=\dfrac{28}{32}=0,875\\ d_{\dfrac{SO_2}{O_2}}=\dfrac{64}{32}=2\\ d_{\dfrac{CH_4}{O_2}}=\dfrac{16}{32}=0,5\)

\(d,M_{N_2}=28\left(\dfrac{g}{mol}\right);M_{SO_2}=64\left(\dfrac{g}{mol}\right)\\ M_{CH_4}=16\left(\dfrac{g}{mol}\right)\\ Nh\text{ẹ}.h\text{ơ}n.kk:N_2,CH_4\\ N\text{ặn}g.h\text{ơ}n.kk:SO_2\)