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CBSE Class 12-science Answered

A solution containing 4 g of a non-volatile organic solute per 100 mL was found to have an osmotic pressure equal to 500 cm of mercury at 27oC27oC.The molecular weight of solute is: A 14.97 B 149.7 C 1697 D 1.497
Asked by gangaram0 | 15 Jul, 2018, 02:21: PM
answered-by-expert Expert Answer
 
 
 
 
 
Option (B) is correct.
 
Given:
 
Weight of solute , W = 4 gm
 
Volume, V= 100 ml
 
            V = 0.1 litre
 
Osmotic pressure, Π = 500 cm of Hg
 
                           Π = 6.57 atm
 
Tmpearture, T = 27 °C 
 
                   T = 300 K
 
We know,
 
πV space equals nRT 6.57 cross times 0.1 equals straight W over straight M cross times 0.082 cross times 300 straight M equals space molecular space weight straight M equals fraction numerator 4 cross times 0.082 cross times 300 over denominator 6.57 cross times 0.1 end fraction straight M equals 149.7
 
 
The molecular weight of solute is 149.7
Answered by Varsha | 15 Jul, 2018, 06:36: PM

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