Molality is the number of moles of the solute dissolved in 1000gram(1 kg) of the solvent. In general we can say that
Molality =Number of moles of the solute/Weight of the solvent in kg
Also note that if w is the number of grams of the solute with molecular weight M & dissolved in W kg of the solvent, then
Molality =w/MW
One molal solution
One molal solution means solution which contains one mole of the solute dissolved in 1kg of the solvent.
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