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```
which is greater molality or molarity?why?

```
6 years ago Sunil Kumar FP
183 Points
```							its not about which is greater.it is simply a method of expressing concentration of a solution.molarity is the no of mole of solute in a given volume of solution.molality is moles of solute in a given (per kg) of solvent.thanks and regardssunil kraskIITian faculty
```
6 years ago Sunil Kumar FP
183 Points
```							suppose for ex 1M kcl 74.5volume=1ltmass of kcl in 1lt=74.5 gmmass of water in 1 lt of otal volume solution=1000g-74.5gm=.925gm=.925 kgmass of solvent=.925 kgmolality=1/.925       =1.08thus in molality wt of the solvent is less than than total volume of the solution in which both are in denominator.because wt of the solute has to be subtracted to get the molality.thanks and regardssunil kraskIITian faculty
```
6 years ago
```							MOLARITY
```
6 years ago
```							Molality. Molarity is moles solute / litres of solution
molality is moles solute / kg solvent

For molality, you find the mass of solution, then subtract the mass of solute to get the mass of H2O
So you use a slightly lower figure for kg of water then you would litres of solution.
Thus molality will always be slightly higher.

eg
1.00 M NaCl
moles NaCl = 1.00 moles
Volume solution = 1.00 L
molarity = 1.00 M

mass NaCl in 1L 1.00 M solution = molar mass x moles = 58.44 g/mol x 1.0 moles= 58.44 g
mass H2O (assuming density = 1 g/ml) = 1000 g - 58.44 g = 941.56 g = 0.94156 kg
molality = 1.00 mol / 0.94156 kg = 1.06 m

The more dilute the solutution, the lower the mass of solute and the more similar kg solvent will be to Litres solution,
thus the more dilute the solution the closer molality and molarity will be.
```
6 years ago
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