MOLARITY
It is a unit of concentration of solution.
Definition:
"Molarity is defined as the number of moles of solute dissolve in 1dm3 of solution"
Formula:
Molarity = no. of moles of solute/volume of solution in dm3
Or
Molarity = mass of solute in gms/molecular mass of solute x volume of solution in dm3  
MOLALITY
 
It is a unit of concentration of solution
Definition:
"Molality is defined as the number of moles of solute dissolved in 1kg of solvent"
Formula:
Molality= no of moles of solute/mass of solvent in kg

Or
Molality = mass of solute in gm/molecular mass of solute x mass of solvent in kg
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