Electrochemistry

We need to define a Faraday first. This is a gram mole of electrons and is equal to 96,500 coulombs where one coulomb is the number of electrons that flow past a given point in one second when the current is 1 ampere. Thus for 2.5 amperes for 1.5 hours the number of coulombs is 2.5*1.5*3600 = 13,500 which converts to 0.14 Faradays. This is the total quantity of electrons used to deposit the vanadium. The "useful" amount is 95% of this value while 5% was lost as heat. You dont need to know that the salt was vanadium nor do you need to know the mass of metal deposited to get the answer.