How is osmotic pressure related to molecular weight of solute?

Define osmotic pressure ? How is the osmotic pressure related to the concentration of a solute in a solution?

The vapour pressure of benzene at 90^@C is 1020 torr. A solution of 5 g of a solute in 58.5 g benzene has vapour pressure 990 torr. The molecular weight of the solute is:

1 litre of a solution containing 500 g of a protein exerts an osmotic pressure of 0.82 atm at 27^@C .The molecular weight of the protein is:

In which of the following molecular weight determination methods, sensitivity of the measurements decreases as the molecular weight of the solute increases ?

The vapour pressure of a solution of a non-volatile electrolyte (B) in a solvent (A) is 95% of the vapour pressure of the solvent at the same temperature. If the molecular weight of the solvent is 0.3 times the molecular weight of solute, the weight ratio of the solvent and solute are:

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 27^@C . The molecular weight of solute is: