TS EAMCET 11-Sep-2020 Shift 2 Solved Paper

Na2O and KO2, both are ionic compounds and are completely ionised as follows :
(i) Na2O⟶2Na++O2−(i=3)
(ii) KO2⟶K++2O2−(i=3)
Also,
∵‌‌‌

p∘−ps

p∘

=i⋅χNa2O+i⋅χKo2
and moles of H2O=‌

1000

18

=555
where, p∘= atmospheric pressure
ps= vapour pressure of solution
p∘=760
=‌

9

61.5

+‌

1.5×3

58.5

=‌

9

61.5

+‌

4.5

58.5

ps=608