Question

Let total moles of the mixtwe bealoo ter ( x ) be the motes of ( mathrm{NO}_{2} )
[
begin{aligned}
text { Moles of } & mathrm{N}_{2} mathrm{O}_{4}=100-mathrm{x}
text { Mo mass }=& text { Vap. dens } times 2
&=34.5 times 2=69
end{aligned}
]
Therefore
[
frac{46 x+(100-x) 92}{100}=69
]
[
begin{array}{c}
9200-96 x=6900
x=frac{2300}{46}=50 mathrm{male}
0 / 0 text { age abluedaree }=frac{50}{100} x(00=50 %
end{array}
]

# 2 Vapour density of mixture of NO, and N, O, is 34 5. then percentage abundance (by mol) of No, in mixture is (2) 25% (3) 40% (4) 60% (1) 50%

Solution