1)Dextran is a polymetric carbohydrate produced by certain bacteria .It is used

Question

1)Dextran is a polymetric carbohydrate produced by certain bacteria .It is used as a blood plasma substitute . An aqueous solution contains 0.582 g of dextran in 106 ml of solution at 21 degrees celsius . It has an osmotic pressure of 1.47mmHg. What is the average molecular weight of the dextran ?

2)Calculate the vapor pressure at 35 degrees celsius of a solution made by dissolving 20.2g of sucrose, C12H22O11, in 60.5g of water. The vapor pressure of pure water at 35 degree celsius is 42.2 mmHg .what is the vapor pressure lowering of the solution ?

Explanation / Answer

This is the rest of the answer ... the remaining part of the 1st anser.
Pa = XaPao [From Raoult's Law]
Pa = vapor pressure of the solution
Pao = vapor pressure of pure solvent
?Pa= lowering of the vapour pressure
Xa = mole fraction of the solvent
Xb = mole fraction of the solute
= (20.2/342)/[(20.2/342)+(60.5/18)]
   = 0.017268

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