realation between molarity and molality?

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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 g mL⁻¹

Mass of solution = V × d

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

= n m_A

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

= V × d – n × m_A

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

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