Free Dalton's Law Calculator
Calculate the total pressure of a gas mixture from individual partial pressures using Dalton's Law of Partial Pressures.
atm
atm
atm
Total Pressure
1.0000 atm
Mole Fraction of Gas A0.5000
Total Pressure vs Partial Pressure of Gas A
Dalton's Law of Partial Pressures
Formula
P_total = P_A + P_B + P_C + ...
Each gas in a mixture exerts pressure independently as if it alone occupied the container. The partial pressure of each gas equals its mole fraction times the total pressure:
P_i = x_i × P_total
Example Calculation
A mixture of N₂ (0.5 atm), O₂ (0.3 atm), and CO₂ (0.2 atm).
- 01P_total = P_A + P_B + P_C
- 02P_total = 0.5 + 0.3 + 0.2
- 03P_total = 1.0 atm
- 04Mole fraction of A = 0.5 / 1.0 = 0.50
Frequently Asked Questions
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