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When density and molarity is given and ask to find the molality what is the formula to be used

When density and molarity is given and ask to find the molality what is the formula to be used

Grade:12th pass

1 Answers

Deepak Kumar
24 Points
6 years ago
Formula ism = (1000*M)/[(1000*d) - (M * MM) ]where,m = required molalityM = given molarityd = density of solution in g/cm^3MM = molar mass in gramsDerivation of formulaLet M is given molarity i.e. there is M number of moles of solute in 1 litre of solutiond = density of solution in g/ccMass of solution = d * 1000 SoMass of solvent = (1000*d) - (M*MM)Now,Molality = no. Of moles of solute/ mass of solvent in kgSo, Molality m = (1000*M)/[(1000*d) - (M * MM) ]

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