Chemistry
Partial Pressure Calculator
Partial Pressure Calculator calculate gas mole fractions and partial pressures from component mole amounts and total mixture pressure using Dalton's law.
Chemistry
Partial Pressure Calculator
Calculate gas mole fractions and partial pressures from component mole amounts and total mixture pressure using Dalton's law.
Formula
Mole fraction_i = moles_i / total moles; partial pressure_i = mole fraction_i x total pressure.
About the Partial Pressure Calculator
Calculate gas mole fractions and partial pressures from component mole amounts and total mixture pressure using Dalton's law.
How the Partial Pressure Calculator Works
Positive component mole amounts are summed, normalized to mole fractions, and multiplied by the entered total absolute pressure while preserving component names.
Formula
Mole fraction_i = moles_i / total moles; partial pressure_i = mole fraction_i x total pressure.
The calculation runs in your browser. Values are validated for required ranges, compatible units, and method-specific restrictions before results are displayed.
Required Inputs
- Gas components: name, moles (required).
- Total absolute pressure (required).
- Pressure unit label (optional).
Results Reported
The result panel reports the final answer and the intermediate quantities needed to check the calculation:
- Component partial pressures
- Component mole fractions
- Total gas amount (mol)
- Sum of partial pressures
- Pressure unit used
Partial Pressure Calculator Example
Select Example Data in the calculator to load this reproducible input set:
| Input | Example value |
|---|---|
| Gas components: name, moles | Nitrogen, 0.78
Oxygen, 0.21
Argon, 0.01 |
| Total absolute pressure | 1 |
| Pressure unit label | atm |
How to Use the Calculator
- Confirm that the calculator title and formula match the quantity you need.
- Enter every required value using the unit shown with its field.
- Select Example Data to inspect a valid input set, or enter your own values and select Calculate.
- Review all reported values and the displayed formula before using the answer.
- Use Copy Result or Download CSV when you need a reusable record.
Accuracy and Limitations
Dalton's law assumes an approximately ideal gas mixture. Use absolute pressure and account for water vapor separately when gas is collected over water.
Keep units consistent, use measurements that represent the actual situation, retain full precision during the calculation, and round only the final answer. Professional decisions may require current official rules, field measurements, laboratory methods, or specialist review.
Frequently Asked Questions
What does the Partial Pressure Calculator calculate?
Calculate gas mole fractions and partial pressures from component mole amounts and total mixture pressure using Dalton's law.
Which formula does the Partial Pressure Calculator use?
Mole fraction_i = moles_i / total moles; partial pressure_i = mole fraction_i x total pressure. Positive component mole amounts are summed, normalized to mole fractions, and multiplied by the entered total absolute pressure while preserving component names.
What should I check before using the Partial Pressure Calculator result?
Dalton's law assumes an approximately ideal gas mixture. Use absolute pressure and account for water vapor separately when gas is collected over water.