1. Chronoamperometry is frequently used to measure diffusion coefficients of electroactive species and surface areas of working electrodes. The following chronoamperometric data were obtained during the oxidation of 0.2 mM ferrocyanide solution at a glassy carbon electrode. The diffusion coefficient for ferrocyanide is 6.3 x 10^-6 cm²/s.
   1. Calulate the area of the glassy carbon electrode
   2. Does the data indicate planar diffusion?

Time, s	i, A
5	7.18
8	5.55
11	4.76
15	4.53
18	3.78
21	3.50