(The queston is from relative molecular mass and mole)
A solution of glycol containing 1.82g per litre has an osmotic pressure of 51.8cm of mercury at 10°C .What is the molecular weight of glycol?
(ans is 62.04)
: w= 1.82g V= 1L π = 51.8 cm =518mm =0.68 atm.
T= 10°C = 283K R= 0.082 lit-atm mol/K M = ?
Formula: πV = wRT/M [n=w/m]
Putting the value of parameter in given formula, the molecular weight of substance is 62.11.