The equation of state for a mixture has exactly the same form but depend on mixing parameters. Empirical mixing rules relate mixture parameters to pure-species parameters. Write a VBA subroutine to calculate a quadratic mixing rule for parameter a: where a = Xixjaij = aij = aji (ajaj) 1/2 and x; and x; are mole-fractions of components i and j. Demonstrate your program for a binary mixture of a vapor mixture of N2 and CH4 at 200K and 30 bar that contains 40 mol.% N2. The relevant constants for N2 and CH4 are given below. aix 105 (bar-cm-mol-2) N2 CH4 10.995 22.786