Analysis of a circuit driving an electrochemical reaction, such as electroplating, can be used to for stoichiometric problem solving. Using the current to determine the amount of metal plated out over time, for example. It takes 96,500 coulombs to constitute a mole of electrons, a unit known as the faraday (F). This conversion is the linchpin of stoichiometric problem solving in electrochemistry.
1 mol of electrons = 1 F = 96,500 C
The MCAT would almost certainly give you this value, but you should remember it anyway.