2 Vapour density of mixture of NO, ...
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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%

JEE/Engineering Exams
Chemistry
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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} ]
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