Q3. A solution contains 2x10- M Fe-- in 1 M HCI initially. The solution is examined by voltammetry at a rotating platinum disk electrode of area 0.25 cm and it shows an anodic limiting current (112) = -4.5 UA. At a current (i) of -2.00 uA from the system, calculate the following 1+1+2 = 4] i mass-transfer coefficient of Fe-- (mFe2+) ii. surface concentration of Fe-- (CFe2+(x = 0 )) and Fe- (CFe3+ (x = 0)) ii. potential of the system at the given condition, i = -2.00 UA Giren mass-transfer coefficient of Fe-(MFe3+) is equal to that of Fe-- (m Fe2+). Consider both Fe and Fe are soluble, Efe3+/Fe2+ = -0.762 V vs. RHE