Partial Pressure Calculator
Calculate the partial pressures of individual gases in a mixture using Dalton's law.
Calculation Parameters
Adjust the values below.
Calculated Result
Expert Tip
Ensure units are correctly formatted (e.g. Kelvin for gas temperatures and liters for volumes) to get chemically accurate outputs.
How this Calculator Works
This calculator allows you to solve Partial Pressure problems dynamically. Adjust the input parameters using the sliders or selection menu below:
- Moles of Gas A (nA) (Range: 0.1 to 10.0, Default: 2.0)
- Moles of Gas B (nB) (Range: 0.1 to 10.0, Default: 3.0)
- Total System Pressure (Ptot, atm) (Range: 0.1 to 10.0, Default: 1.0)
The results are computed instantly and updated in the results panel on the right.
Formula & Methodology
P_i = X_i * P_total
Where:
- Moles of Gas A: Parameter value.
- Moles of Gas B: Parameter value.
- Total System Pressure: Parameter value.
Step-by-Step Calculation Example
To calculate Partial Pressure manually, follow these steps:
- Identify the input parameters. For example:
- Moles of Gas A (nA) = 2.0
- Moles of Gas B (nB) = 3.0
- Total System Pressure (Ptot, atm) = 1.0
- Apply the formula:
X_i = n_i / n_total
P_i = X_i * P_total - Verify the calculated value which is updated instantly in the results panel on the right.
Frequently Asked Questions
What is Dalton's Law of Partial Pressures? ▼
P_total = P1 + P2 + ... + Pn, stating total pressure of a non-reacting gas mixture equals the sum of partial pressures.
How do you calculate partial pressure from mole fraction? ▼
P_i = X_i × P_total, where X_i is mole fraction of gas i in the mixture.
What is the mole fraction of O2 in dry atmospheric air? ▼
Dry atmospheric air is approximately 20.95% O2 by volume, so X_O2 = 0.2095.