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Mole Fraction from Partial Pressures (Dalton's Law) Calculator

x_i = P_i / P_total for an ideal-gas mixture.

Compute the mole fraction of each component in an ideal-gas mixture from up to four partial pressures using Dalton's law: x_i = P_i / Σ P_j. Reports the total pressure, individual mole fractions, and verifies they sum to 1.

Dr. Helena Ortiz By Dr. Helena Ortiz
Published Last reviewed 1 min read

Inputs

atm
atm
atm
atm

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

x_i = P_i / Σ P_j

In depth

Compute the mole fraction of each component in an ideal-gas mixture from up to four partial pressures using Dalton's law: x_i = P_i / Σ P_j. Reports the total pressure, individual mole fractions, and verifies they sum to 1.