Dalton Law Calculator Form
Use direct partial pressures, mole fractions, or gas amounts.
Example Data Table
Example using known partial pressures for a dry gas mixture.
| Gas | Partial Pressure (kPa) | Mole Fraction | Mixture Share (%) |
|---|---|---|---|
| Nitrogen | 78.000000 | 0.780000 | 78.0000 |
| Oxygen | 21.000000 | 0.210000 | 21.0000 |
| Argon | 0.930000 | 0.009300 | 0.9300 |
| Carbon Dioxide | 0.070000 | 0.000700 | 0.0700 |
Formula Used
These relationships apply to nonreacting gas mixtures under conditions where ideal-gas behavior is a reasonable approximation.
How to Use This Calculator
- Select the calculation method that matches your available data.
- Choose the preferred output pressure unit for the results table.
- Enter gas names so the output clearly identifies each component.
- Provide partial pressures, mole fractions, or moles as required.
- For the moles method, add temperature and container volume.
- Use a named blank row with known total pressure to solve one missing value.
- Press Calculate to view the result summary above the form.
- Download the finished result as CSV or PDF when needed.
FAQs
1. What does Dalton's law state?
Dalton's law states that the total pressure of a nonreacting gas mixture equals the sum of the individual partial pressures of all component gases.
2. When should I use the mole fraction method?
Use the mole fraction method when you already know the overall pressure and the composition of the mixture, expressed as fractions or percentages.
3. Can this calculator solve a missing partial pressure?
Yes. Enter the known total pressure, list known partial pressures, then add one named gas with a blank pressure field to calculate the missing value.
4. Why does the moles method need temperature and volume?
That method uses the ideal gas equation for each component. Temperature and container volume are required to turn gas amount into partial pressure.
5. What if my mole fractions do not sum to one?
If they sum to less than one, the calculator treats the remainder as unlisted gases unless one named blank row is available to solve automatically.
6. Which pressure units are supported?
The calculator supports Pa, kPa, MPa, bar, atm, mmHg, and psi, allowing both convenient input and flexible reporting.
7. Does Dalton's law always hold exactly?
It works best for nonreacting gases under conditions close to ideal behavior. High pressures or strong intermolecular effects can reduce accuracy.
8. Can I use this for classroom and lab work?
Yes. It is suitable for physics exercises, chemistry labs, process calculations, and quick verification of gas mixture pressure relationships.