Ttoi muốn ccccc có đp

ĐÁp án

21.

`a)`

`M_{hh}=10(g//mol)`

`Hh:\ N_2:x(mol);H_2:y(mol)`

`->x+y={32,277}/{24,79}=1,3(1)`

Lại có `28x+2y=1,3.10=13(2)`

`(1)(2)->x=0,4;y=0,9`

`\%V_{N_2}={0,4}/{1,3}.100\%=30,77\%`

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

`b)`

`n_{N_2\ them}=x(mol)`

`->{28x+13}/{x+1,3}=0,46875.32=15`

`->x=0,5(mol)`

`->V_{N_2\ them}=0,5.24,79=12,395(L)`

22.

Cho tất cả đều là 1 mol.

`M_A={44+56}/{1+1}=50(g//mol)`

`M_B={28+28}/{1+1}=28(g//mol)`

`->d_{A//B}={50}/{28}\approx 1,79`

23.

`a)`

Cho 1 mol X

`->n_{NO}=0,3(mol);n_{N_xO}=0,3(mol);n_{CH_4}=0,4(mol)`

`->m_X={0,4.16}/{22,377\%}=28,6(g)`

`->M_{N_xO}={28,6-0,3.30-0,4.16}/{0,3}=44`

`->x=2`

`->N_2O`

`b)` `d_{X//kk}={{28,6}/{0,4}}/{29}\approx 2,5`