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relation between molarity and molality
3 years ago

Answers : (2)

bharat bajaj
IIT Delhi
askIITians Faculty
123 Points

Molarity/Molality = (moles of solute/volume of solution) × (mass of solvent/moles of solute)

= mass of solvent (in kg)/volume of solution (in litre)

= mass of solvent (in grams)/volume of solution = W/V

Let the density of the solution be d. Unit= g mL−1

Mass of solution = V × d

Mass of solute = number of moles × molecular mass of solute

= n mA

Mass of solvent, W = mass of solution – mass of solute

= V × d – n × mA

Thus, Molaity/Molality (M/m) = V×d–n×mA/V

Molaity (m) = molarity×V/V×d–n×mA


m =molaity/d–molaity×mA

where wZ, wBare masses of solvent and solute respectively xAand xBare mole fractions of solvent and solute respectively mAis molecular mass of solvent.


Bharat Bajaj

Askiitians faculty

3 years ago
Arun Kumar
IIT Delhi
askIITians Faculty
256 Points

Thanks & Regards, Arun Kumar, Btech,IIT Delhi, Askiitians Faculty
3 years ago
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