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One litre solution X has x g of urea dissolved in it. Another one litre solution Y has xg of KCl dissolved in it. Find the ratio of lowering of vapour pressures of the solutions X and Y. |
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Answer» Solution :The ratio of concentration = The ratio of number of MOLES The MOLE ratio =`x/60:x/74.6=7.46 :6` Urea is unionised even in dilute solutions and hence, van.t HOFF factor, i = 1. KCL is almost ionised in dilute solutions and hence, van.t Hoff factor, i 2. Hence the ratio of particles in two solutions 7.46 : 6 x 2 =7.46 : 12 =1 : 16 Since lowering of vapour pressure is a colligative PROPERTY, the ratio of lowering = 1: 1.6 |
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