Chemistry
Molar volume at a given state
The volume one mole occupies. At 0 C and 101.325 kPa it equals 22.4139695 litres per mole.
The Formula
V m = V / n = R T / P
The volume one mole occupies. At 0 C and 101.325 kPa it equals 22.4139695 litres per mole.
| Symbol | Meaning | Unit | Notes |
|---|---|---|---|
| V m | Molar volume | litres per mole | Volume per mole, so it depends on the conditions, not on the gas. |
| P | Pressure at which the molar volume is measured | pressure | The same pressure that must match the value of R. |
What Each Symbol Means
V mlitres per mole
Molar volume
Volume per mole, so it depends on the conditions, not on the gas.
Ppressure
Pressure at which the molar volume is measured
The same pressure that must match the value of R.
See It Worked With Real Numbers
A formula on its own does not tell you which number goes where. The how to calculate the ideal gas law 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 The Ideal Gas Law, filed under Science. Every number the guide produces comes from substituting into this one line.