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relation between molarity and molality

relation between molarity and molality
 

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2 Answers

bharat bajaj IIT Delhi
askIITians Faculty 122 Points
9 years ago

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

=molaity/d–n/V×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.


Thanks

Bharat Bajaj

Askiitians faculty

Arun Kumar IIT Delhi
askIITians Faculty 256 Points
9 years ago
Hi


Thanks & Regards, Arun Kumar, Btech,IIT Delhi, Askiitians Faculty

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