Stoichiometry & gases · SL/HL
Ideal gas equation
Solve for pressure, volume, amount or temperature.
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Number formats & units
Use decimal dots in datasets. Single values also accept decimal commas and scientific notation such as 1.2e-3 or 1.2 × 10⁻³.
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Result & working
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Interpretation & assumptions
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Formula & example
The relationship
What the variables mean
| Symbol | Meaning |
|---|---|
| Gas pressure in kPa. | |
| Gas volume in dm³. | |
| Absolute temperature in K. |
Worked example
- Solve for
- Amount n
- Pressure P / kPa
- 101.3
- Volume V / dm³
- 24.0
- Temperature T / K
- 293.15
0.9974626 mol
Follow the example steps
- n = PV/RT = 101.3 × 24 / (8.314463 × 293.15) = 0.9974626 mol
Common mistakes
Use absolute temperature in kelvin.
Incorrect approach
25 °C ⇒ T = 25 K
Correct approach
T = 25 + 273.15 = 298.15 K
More checks before you submit
- Do not use °C directly.
- Use a gas constant consistent with the pressure and volume units.
Method notes
The ideal-gas model is most appropriate when intermolecular interactions and molecular volume have small effects. Convert °C to K before using the equation.