Partial Molar Enthalpy

The enthalpy of a binary mixture of and is plotted as a function of the mole fraction of component . For an ideal solution, the enthalpy of the mixture is a linear function of the molar enthalpies of the pure components. For a non-ideal solution, you can vary a parameter that describes the deviation from ideality. One can define partial molar enthalpies, which are obtained by drawing a tangent at the value of the mole fraction of the solution. The intersections of this tangent with the axis at and correspond to the partial molar enthalpies of and , respectively. You can also vary the mole fraction of in the mixture, as indicated by the dot on the curve.
  • Contributed by: Simon M. Lane
  • (University of Colorado Boulder, Department of Chemical and Biological Engineering)


  • [Snapshot]
  • [Snapshot]
  • [Snapshot]


= partial molar enthalpy of component (kJ/mol)
= partial molar enthalpy of component (kJ/mol)
= molar enthalpy of component (kJ/mol)
= molar enthalpy of component (kJ/mol)
= molar enthalpy of mixture (kJ/mol)
, equation for enthalpy of non-ideal binary mixture
= non-ideal parameter
    • Share:

Embed Interactive Demonstration New!

Just copy and paste this snippet of JavaScript code into your website or blog to put the live Demonstration on your site. More details »

Files require Wolfram CDF Player or Mathematica.

Mathematica »
The #1 tool for creating Demonstrations
and anything technical.
Wolfram|Alpha »
Explore anything with the first
computational knowledge engine.
MathWorld »
The web's most extensive
mathematics resource.
Course Assistant Apps »
An app for every course—
right in the palm of your hand.
Wolfram Blog »
Read our views on math,
science, and technology.
Computable Document Format »
The format that makes Demonstrations
(and any information) easy to share and
interact with.
STEM Initiative »
Programs & resources for
educators, schools & students.
Computerbasedmath.org »
Join the initiative for modernizing
math education.
Step-by-Step Solutions »
Walk through homework problems one step at a time, with hints to help along the way.
Wolfram Problem Generator »
Unlimited random practice problems and answers with built-in step-by-step solutions. Practice online or make a printable study sheet.
Wolfram Language »
Knowledge-based programming for everyone.
Powered by Wolfram Mathematica © 2016 Wolfram Demonstrations Project & Contributors  |  Terms of Use  |  Privacy Policy  |  RSS Give us your feedback
Note: To run this Demonstration you need Mathematica 7+ or the free Mathematica Player 7EX
Download or upgrade to Mathematica Player 7EX
I already have Mathematica Player or Mathematica 7+