Electrochemistry can be used to measure electric current in a silver coulometer. The cathode is weighed before and after the passage of the current. A silver cathode initially has a mass of 10.77 grams and its mass increases to 12.89 grams after current has flowed for 15.0 minutes. Compute the quantity of charge in coulombs and the current in amperes.
To answer this question, one must use Faraday's constant which is 96,490 C/mole of electrons.
Since we know that silver(Ag) is probably in the plus one state Ag+, it requires one electron to become Ag ...
The answer is given with short explanations.