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well the equation says that p*v=n*R*T
where p is the osmotic pressure, R is the universal gas constant and T is the absolute temperature and n is the number of moles, substituting the values you can find the desired values if you need to calculate n then,
n= (molecular mass of the substance){say M}/(mass of the the solute){say w}
by substituting we get
M=(W*R*T)/(p*v)
again you can calculate the desired value
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