\(M_A=2,875.32=92\left(\dfrac{g}{mol}\right)\)

Chọn D

\(M_{O_2}=32\left(gmol\right)\)

\(M_{H_2O}=1.2+16=18\left(gmol\right)\)

=> Chọn B

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 $CH_4$

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

Câu 49 :

$M_B = 0,5.32 = 16(g/mol)$
$M_A = M_B.2,125 = 16.2,125 = 24(g/mol)$

Đáp án A

a) M_A = 4.16 = 64 (g/mol)

b) \(n_A=\dfrac{16}{64}=0,25\left(mol\right)=>V_A=0,25.22,4=5,6\left(l\right)\)

\(a,M_A=12+4.1=16(g/mol)\\ n,n_A=\dfrac{16}{16}=1(mol)\\ V_A=1.22,4=22,4(l)\)

D

\(n_{H_2SO_4}=\dfrac{19,6}{98}=0,2(mol)\)

Chọn D

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

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

A

\(n_{O_2}=\dfrac{2,479}{24,79}=0,1(mol)\\ \Rightarrow A\)