Partial Pressure Calculator

Find a gas's partial pressure from its mole fraction.

Partial pressure (atm) 0.21

Formula: P_partial = mole fraction × total pressure

Step-by-step with your numbers:

1. Values used:

2. Mole fraction = 0.21

3. Total pressure = 1 atm

5. Partial pressure = Mole fraction x Total pressure = 0.21 x 1 = 0.21atm

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Dalton's law: each gas contributes pressure in proportion to its mole fraction.

The math behind it

partial pressure = mole fraction × total pressure.

Oxygen (0.21) at 1 atm → 0.21 atm.

Sum of partials?

Equals the total pressure (Dalton's law).