Exercise 4 The dependence of the mixing enthalpy of the benzene (1) - 2,2-dimethylbutane (2) system on the composition at 25C can be approximated by the relation HE/(Jmol1)=3630x1x2. Based on this relationship, determine the heat associated with the addition of 4 moles of 2,2-dimethylbutane to 6 moles of the mixture under consideration with an initial composition of x1=0.5. Justify your access to the solution