Use this chemistry calculator to reproduce a named relationship with explicit quantities and units for study, laboratory planning, or an independent numerical check.

Pure solvent pressure

Vapor pressure of the pure solvent.

Solvent mole fraction

Mole fraction of the solvent after adding solute.

Apply Raoult's law to compute solvent vapor pressure above a solution from its mole fraction. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Solution pressure

Vapor pressure of solvent over the solution.

• The result is conditional on the stated model, constants, standard state, temperature, pressure, composition, and unit basis. Real mixtures and measurements can depart from ideal behavior and carry uncertainty not represented by a single calculated value.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Check units and significant figures, compare the result with limiting cases, and use measured or source-specific constants where available. Laboratory, safety, and regulatory decisions require validated methods and appropriate uncertainty analysis.

• Dalton Partial Pressure

  Compute the partial pressure of a gas as total pressure times its mole fraction.

• Vapor Pressure Lowering

  Estimate relative vapor pressure lowering from the solute mole fraction.

• Mixing Enthalpy

  Compute ΔH_mix as the measured mixture molar enthalpy minus the mole-fraction-weighted pure-component enthalpies; an ideal solution gives zero.