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Raoult's Law — result sheet
Calculate a volatile solvent mole fraction, ideal solution vapor pressure, and pressure lowering.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: Solvent mole fraction x = n_solvent / (n_solvent + n_solute); solution vapor pressure P = x P0; pressure lowering = P0 - P.
Raoult's law gives the partial vapor pressure of one volatile solvent in an ideal solution with a nonvolatile solute. This calculator reports the solvent mole fraction and the corresponding pressure decrease from the entered pure-solvent pressure.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Solvent amount — mol; Enter a finite positive amount for the one volatile solvent.; minimum 1.0E-6; maximum 1000000000
- Solute amount — mol; Enter a finite nonnegative amount of nonvolatile solute.; minimum 0; maximum 1000000000
- Pure-solvent vapor pressure — kPa; Use the pure-solvent pressure at the stated temperature; the same unit is reported.; minimum 1.0E-6; maximum 1000000000
Worked example
| Input | Value |
|---|---|
| Solvent amount | 1 |
| Solute amount | 0.5 |
| Pure-solvent vapor pressure | 23.8 |
Solvent mole fraction is 0.666667; solution vapor pressure is 15.8667 kPa; pressure lowering is 7.93333 kPa.
Assumptions and limits
- There is one volatile solvent and one nonvolatile solute, with solvent and solute amounts in moles.
- The liquid solution is ideal and the pure-solvent vapor pressure is entered at the relevant temperature in kPa.
- Temperature variation, solute volatility, activity coefficients, vapor-phase composition, and boiling-point prediction are not modeled.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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