Consider a binary system of components A and B. In the following questions, use the symbols provided in the problem and define any new ones you introduce in your equations. For simplicity, you may consider a one-dimensional system. (a) (10 points) Write an expression for the molar flux of A relative to coordinates moving with the molar average velocity, and another expression for the molar flux of A relative to stationary coordinates. In your expressions include the diffusion coefficient of A in B, D AB , and the mole fraction of A, y A