vapour pressure of solution of urea is 736.2 mm at 100 degress celsius calculate osmotic pressure of this solution at 15 degress celsius.

 

Asked by dhrubajyoti.das | 9th May, 2021, 09:54: PM

Expert Answer:

Relation between vapour pressure and osmotic pressure-
fraction numerator P subscript o minus P over denominator P subscript o end fraction equals M o l e space f r a c t i o n equals fraction numerator pi M over denominator d R T end fraction
A s s u m e space P subscript o equals 1 a t m equals 760 space m m space o f space H g
T equals 100 plus 273 equals 373

fraction numerator 760 minus 736.2 over denominator 760 end fraction equals fraction numerator pi cross times 18 over denominator 1000 cross times 373 cross times 0.0821 end fraction
fraction numerator 23.8 over denominator 760 end fraction equals fraction numerator pi cross times 18 over denominator 1000 cross times 373 cross times 0.0821 end fraction
pi equals fraction numerator 23.8 cross times 100 cross times 373 cross times 0.0821 over denominator 18 cross times 760 end fraction
pi equals fraction numerator 72883.454 over denominator 13680 end fraction
pi equals 5.327 space a t m

W e space k n o w space t h a t space pi equals C R T
fraction numerator space pi over denominator T end fraction equals C R equals C o n s tan t
pi subscript 1 over T subscript 1 equals pi subscript 2 over T subscript 2
fraction numerator 5.327 over denominator 373 end fraction equals pi subscript 2 over 288
pi subscript 2 equals fraction numerator 5.327 over denominator 373 end fraction cross times 288
pi subscript 2 equals 0.014281 cross times 288 equals 4.1130 space a t m

Answered by Ravi | 13th May, 2021, 04:06: PM