The following chemical reactions take place in a C 12.1 closed system A +D C uilibrium, they can be characterized by At eq the nomenclature c, represents the concentration where of constituent i. If x, and x2 are the number of moles of C that are produced due to the first and second reactions, re- spectively, use an approach to reformulate the equilibrium relationships in terms of the initial concentrations of the constituents. Then, solve the pair of simultaneous nonlinear equations for x, and x2 if K 4 x 104, K2 3.7 x 102 ,-50, ??.0-20, cc,-5, and c40-10. (a) Use a graphical approach to develop your initial guesses. Then use these guesses as the starting point to determine refined estimates with (b) the Newton-Raphson method, and (c) the fsolve function.