Thermodynamics — Thermodynamic System and Functions
First create a Thermodynamic System  including the five species needed for this model: hydrogen, methane, benzene, toluene, and biphenyl.
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This starts the Thermodynamic System Wizard.
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methane (74-82-8, CH4)
benzene (71-43-2, C6H6).
toluene (108-88-3, C7H8).
biphenyl (92-52-4, C12H10).
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Vapor–Liquid System 1 (pp1)
You can now use the added Vapor–Liquid System 1 , to define a mixture function for the enthalpy of formation. This is needed for the heat source in the Reaction Engineering interface.
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Note that the properties can be searched by typing a property name in the text field at the top.
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Mixture Property: Enthalpy of formation 1
Change the function name to hF_mixture.
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Thermodynamics  > Vapor–Liquid System 1  > Mixture > Vapor.
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In the Settings window for Mixture Property, type hF_mixture in the Function name text field.
This function will be used in the variable definitions below.