point Example 5B.1 Identifying the parameter for a regular solution Identify the value of the parameter that would be appropri- and estimate the Gibbs energy of mixing to produce an equi- ate to model a mixture of benzene and cyclohexane at 25C molar mixture. Method Refer to Fig. 5B.3a and identify the value at the curve maximum, and then relate it to eqn 5B.6 written as a molar quantity (H = ERTxAxg). For the second part, assume that the solution is regular and that the Gibbs energy of mixing is given by eqn 53.7