Question

Two solutions are prepared. In Solution A, 5.0 g of a substance of molecular weight 50 is dissolved in 100 mL of pure water. In Solution B, 5.0 g of a substance with molecular weight of 75 is dissolved in 100 mL of pure water. The solute is non volatile and non ionic. Which solution will have the higher osmotic pressure?
They will be the same, because osmotic pressure depends only on the amount of solute.
Solution A
Solution B
They will be the same because the solvent is the same in both cases.
My answer: Solution A
Reason: solution A has a smaller molecular weight and therefore, a larger Molarity and higher osmotic pressure (pi=iMRT)

Answer 1

I agree.