Lesson in Electrochemistry....

A mole of a substance is defined as that number of grams of a substance equal to it's atomic  weight.  For example if we look at neon ( Ne) the atomic weight is 10.
This means that that 10 grams of Ne  is one mole.    Furthermore it contains 6.02 x 10^23 molecules and ( as a gas)  it occupies 22.4 liters at standard temp and pressure.    It should be noted that Ne is a special case as a molecule of Ne is a single atom.   It is called an inert gas.  It does not mix with other molecules and it does not combine with itself.   This is not the case for oxygen and hydrogen.  Both of these in their gas state exists as 2 atoms per molecule  H2  and O2.  The atomic weight for oxygen is 8 and hydrogen is 1.  Water is a combination of hydrogen and oxygen.  it's represented by H2O or 2 molecules of hydrogen for every one of oxygen.  It has an atomic weight of 10 ( 8 for oxygen and 1 for each of two hydrogen molecules).
More information on this stuff is on the web.

We know that:
1 liter = (approximately) 1 quart.
the charge on one electron =  Qe = 1.9 x 10^-19 coulomb
1 amp = 1 coulomb per second.
1 mole of a gas = 22.4 liters
1 mole of a gas = 6.02 x 10^23 molecules (Avogadro’s number = Na).

Start with 2 molecules of water changing to HHO gas

2H2O + 2 electrons =  2H2 + O2

or 2 moles of water  + 2 x Na electrons = 3 moles of gas which is 67.2 liters.

Now if we have 3 charged objects with a charge of 2 coulombs on each the total charge is 6 coulombs.

by a similar argument  2 moles of electrons ( 2 x 6.02 x 10^23)  times the charge on each ( 1.9 x 10^-19) equals the total charge in coulombs.

or 2 x 6.02 x 10^23 x 1.9 x 10^-19  = 230,000 coulombs.

if we assume all of the above happens in one minute then the current is given by 230,000/60  = 3833
coulombs per second or 3833 amps.

But all this produces 67.2 liters of gas.  If we only want 1 liter of gas per minute we divide by 67.2

3833/ 67.2 = 57 amps.

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