Moles per kilogram (molal) to weight percent
Type a value in mol/kg to get it in % w/w instantly.
That's 3.2× as concentrated as medical saline, while seawater, counted as salt is 1.24× more concentrated. Dissolved in water, that lowers the freezing point by about 0.93 °C (twice that for salt).
Convert the other way: % w/w to mol/kg
What it means
How concentrated is that?
Weight percent and grams per kilogram use the solute chosen above. The freezing-point figure is for water and a solute that does not split into ions; salt roughly doubles it.
The math
How to convert mol/kg to % w/w
Weight percent is 100 × m·M ÷ (1000 + m·M), with m in mol/kg and M the molar mass in g/mol. The figures below use the solute chosen above.
Example: 0.5 mol/kg = 2.83904 % w/w.
Weight percent and g/kg below are for Table salt, NaCl (58.44 g/mol). Change it above and they update.
Every unit
Your molality in every unit
Tables
mol/kg to % w/w conversion table
| mol/kg | % w/w |
|---|---|
| 0.001 mol/kg | 0.00584366 % w/w |
| 0.01 mol/kg | 0.0584059 % w/w |
| 0.05 mol/kg | 0.291349 % w/w |
| 0.1 mol/kg | 0.581005 % w/w |
| 0.155 mol/kg | 0.897689 % w/w |
| 0.25 mol/kg | 1.43996 % w/w |
| 0.5 mol/kg | 2.83904 % w/w |
| 1 mol/kg | 5.52133 % w/w |
| 2 mol/kg | 10.4649 % w/w |
| 3 mol/kg | 14.9168 % w/w |
| 5 mol/kg | 22.6126 % w/w |
% w/w to mol/kg conversion table
| % w/w | mol/kg |
|---|---|
| 0.001 % w/w | 0.000171117 mol/kg |
| 0.01 % w/w | 0.00171133 mol/kg |
| 0.05 % w/w | 0.00856006 mol/kg |
| 0.1 % w/w | 0.0171287 mol/kg |
| 0.155 % w/w | 0.0265641 mol/kg |
| 0.25 % w/w | 0.0428861 mol/kg |
| 0.5 % w/w | 0.0859878 mol/kg |
| 1 % w/w | 0.172844 mol/kg |
| 2 % w/w | 0.349216 mol/kg |
| 3 % w/w | 0.529224 mol/kg |
| 5 % w/w | 0.900609 mol/kg |
Quick answers
Quick answers
- How many % w/w is 1 mol/kg?
- 1 mol/kg is 5.52133 % w/w.
- How many % w/w is 10 mol/kg?
- 10 mol/kg is 36.8846 % w/w.
- How many % w/w is 0.5 mol/kg?
- 0.5 mol/kg is 2.83904 % w/w.
The units
About these units
Moles per kilogram (molal) (mol/kg)
The SI unit of molality, also written m or molal.
Weight percent (% w/w)
Solute as a share of the whole solution’s weight.
Keep going