Chemistry
Concentration from moles
Moles divided by volume in litres gives molarity. It is the last step from a weighed sample to a usable solution concentration.
The Formula
c = n / V
Moles divided by volume in litres gives molarity. It is the last step from a weighed sample to a usable solution concentration.
| Symbol | Meaning | Unit | Notes |
|---|---|---|---|
| n | Amount of substance | moles | Moles obtained from the mass and molar mass. |
| V | Volume of solution | litres | The final volume, not the volume of water added. |
| c | Concentration | moles per litre | Molarity, in moles per litre. |
What Each Symbol Means
nmoles
Amount of substance
Moles obtained from the mass and molar mass.
Vlitres
Volume of solution
The final volume, not the volume of water added.
cmoles per litre
Concentration
Molarity, in moles per litre.
See It Worked With Real Numbers
A formula on its own does not tell you which number goes where. The how to calculate molar mass page applies this equation to a concrete case, shows every intermediate step, and names the mistakes that produce a wrong answer even when the algebra is right.
Where This Formula Appears
This equation is the working core of How To Calculate Molar Mass, filed under Science. Every number the guide produces comes from substituting into this one line.