which one is greater molality or molarity? why?

The molality of solution is always greater than the molarity. Actually, in molarity we calculate mol per unit L (i.e. volume of solution) while in molality we calculate moles per unit Kg (i.e. mass of solvent).
Since, volume of solution = mass of solution / density
Further mass of solvent = mass of solution - mass of solute
So, anyhow mass of solvent is less than volume of solution and thus the molality will be greater. 

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