Can someone help me find the number of moles (electrochemistry)

Question

Consider the electrolysis of water to generate H2 (g). Under an applied voltage of 5V, the electrolysis reaction draws 0.1Amps of current to produce hydrogen and oxygen. After 20 minutes, the number of moles of hydrogen produces is: (recall you have to determine the number of electrons required to produce one H2).

How do I do this? Help!

Answer 1

calculate Coulombs = amps  times seconds:

Coulombs = 0.1 amp( 1200) = 120 coulombs

calculate moles of electrons using Faraday,s constant:

120 coulombs @ 1 mole electrons / 96,500 colombs= 1.24e-3 moles of electrons

since Hydrogen takes 2 electrons to make H2,

1.24e-3 mol electrons, makes

your answer: 6.2e-4 moles of H2