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Raoult's Law Calculator

Chemistry
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Calculates the vapor pressure of an ideal solution using Raoult's Law. It can also determine the vapor pressure and mole fraction of a pure solvent in a solution.

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How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter Vapor Pressure of Pure Solvent (P°) and Mole Fraction of Solvent (Xsolvent) in the units shown.

Step 2

Read Vapor Pressure of Solution (Psolution) in the results panel. Results update as you change the inputs.

Step 3

Choose a preset to load an example, then adjust the values for your situation.

Worked Examples

Example calculations

See the inputs and their calculated results.

Example 1

Vapor Pressure of Pure Solvent (P°): 760 mmHg; Mole Fraction of Solvent (Xsolvent): 0.95

Vapor Pressure of Solution (Psolution): 722 mmHg

Example 2

Vapor Pressure of Pure Solvent (P°): 23.8 mmHg; Mole Fraction of Solvent (Xsolvent): 0.8

Vapor Pressure of Solution (Psolution): 19.04 mmHg

Example 3

Vapor Pressure of Pure Solvent (P°): 150 mmHg; Mole Fraction of Solvent (Xsolvent): 0.6

Vapor Pressure of Solution (Psolution): 90 mmHg

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