state the equation for the determination of molecular mass using (i)osmotic pressure (ii)depression of freezing
Why not look these up in your text book?
Why not use Google?
osmostic pressur = pi
pi = MRT
pi is the pressure
M is the molarity
R is the gas costant
T is temperature in kelvin.
f.p. depression.
delta T = Kf*molality
Kf is the freezing point constant.