Question

which is better molality or molarity and why give reason??

Answer 1

hey miss
here is ur answer
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Molality is linked with mass of solvent and molarity is linked with volume of solvent. As Volume is a function of temperature, it changes with rise or fall in temp. But mass is not a function of temperature. Therefore molality is considered better while expressing concentrations.
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I hope this will help
#Prem✌✴✴✴✌✴✌✴

Answer 2

[1] Molality is always better than molarity
as molality = moles of solute / wt of solvent

moles of solute = given wt / molecular wt of solute

hence molality = given wt / molecular wt * wt of solvent

[2] While molarity = moles of solute / volume of solution

# from [1] it shows that molality is totally depends only on mass or wt of components of solution
while from [2] it shows that molarity is depend on wt of solute as well as volume

# Volume is not stable, it changes as surrounding temperature changes, therefore molarity (M) Also changes
# But mass is conservative type it is usually stable and not changes according to surrounding temperature hence molality (m) also not changes. it remains constant
# m and M both are measurements of concentration of solution. But that measurements is considered to be better which does not change according to surrounding conditions and remain constant or stable anywhere. as molality is stable than molarity ............It is better.