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Concentrations in molality (moles of solute per kilograms of solvent) are independent of temperature and pressure whereas concentrations in molarity (moles of solute per total volume of solution in liters) are not.
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molarity--->moles of soliet per litet(1000ml)of solution
molality---->mole of solute per kg(1000grams)of solvent
As u asked why molarity is advantage than molality ...molality does not change it value when the temperature increase or decrease .
Where as in molarity the value will change according to the temperature .. 

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