10 g of solute A and 20 g of solute B both are dissolved in 500 ml. of water. The solution has the same osmotic pressure as 6.67 g of A and 30 g of B are dissolved in the same volume of water at the same temperature. If the ratio of molar masses of A and B is x/y, find x + y.
Text Solution
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Let M A and M B are the molar masses of A & B respectivey when 10 g of A and 20 g of B are both dissolved in 500 ml of water, then concentration of this solution will be C 1 = 
moles/lt.
In second case, when 6.67 g of A and 30 g of B are dissolved in same volume of water then concentration of this solution will be C 2 = 
M.
As both solution have same osmotic pressure at same temperature.
π 1 = π 2
C 1 RT = C 2 RT
C 1 = C 2 or 
= 
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