For the Kirkendall experiment, pure copper is plated onto brass with a composition of 70wt.\% Cu-30wt.\% Zn, and inert Mo wires as marker are at the initial interface between pure copper and brass. After 56 days of 785C, the marker velocity was determined to be 2.6108m/s. Microanalysis shows the composition at marker was XZn=0.22,XCu=0.78 and that xXZn was 0.089mm-1. EDS analysis of the composition profile near the interface gives interdiffusion coefficient D at the Mo markers as 4.51013m2/s. Please calculate intrinsic diffusion coefficients for Zn and Cu,DZn and DCu, respectively, for the composition of XZn=0.22. Note that pure Cu and the brass alloy are in the single-phase region