3. In the frame of the Flory-Huggins theory, estimate the entropic change related to mixing 10/90 mass parts of: linear polypropylene of Mpp = 2000 kg/mol and xylene, linear polypropylene of Mpp = 20 kg/mol and xylene, linear polypropylene of Mpp = 2000 kg/mol and tetralin, linear polypropylene of Mpp = 20 kg/mol and tetralin, linear polypropylene and polystyrene, each of M= 2000 kg/mol. The mass density of the different components can be approximated by 1 g/cm. Explain the obtained results! =