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Molarity-moles per liter solution.
molality-moles per kilogram solvent.
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molarity is the number of moles of solute per litre of solution... (mol/litre)........therefore M = no. of moles of solute / vol of solution.........
molality is the no. of moles of solute per kg of solvent..... therefore  
m = no. of moles of solute / weight of solvent in kg....
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