Given the 1-parameter Margules equation, plot the molar Gibbs free energy of mixing as a function of x₁ for three temperatures: 325 K, 300.7 K, and 250 K on the same plot. Determine if there is a miscibility gap at each of the three temperatures. For this study, let the product of the Margules parameter (A) and RT be equal to 5000 J/mol.