Elements and Compounds

# How much hydrogen is in one gallon of water?

454647 ###### 2007-07-29 03:52:34

If you mean hydrogen gas, H2, just naturally present in the water, then essentially none.

If you mean how much hydrogen gas could be generated by the electrolysis of 1 gallon of water, that is a stoichiometry problem. The balanced reaction is:
2H2O --> 2H2 + O2
The mass of 1 gallon of water is 3.7854 kilograms, which is 210.3 moles of H2O. From the stoichiometry, there is a 1 to 1 (2 to 2) ratio of water to hydrogen produced, and so 210.3 moles of H2 will be produced. 210.3 moles of H2 weighs 420.6 grams, or just under one pound (see the Related Questions links to find out how to calculate the volume of that much H2 produced).

If you mean hydrogen ions, H+, then it depends on the pH of the water. In perfectly pure, neutral water with pH of 7, then the concentration of H+ is 10-7 moles per liter. In one gallon, there are 3.7854 liters. So in one gallon of pure water, there are 3.7854 * 10-7 moles of H+.

See the Related Questions for more information about pH and how it measures the concentration of H+.

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## Related Questions The chemical formula for water is H2O. In one gallon of water, there are 210 moles. This means that breaking apart the water will release 420 moles of hydrogen gas. This is equivalent to 4710 liters of gas. Burning 1 gallon of gasoline produces 1.52 gallons of water. How this is calculated:1 gallon of gasoline weights 8.66lbs, of which 1.4 lbs is Hydrogen, as gasoline contains 16% Hydrogen and 84% carbon by weight.This assumes gasoline has the chemical formula of C8H18, the same as Octane.Water is 11% Hydrogen and 89% Oxygen by weight. One gallon of water weights 8.35lbs, and contains .92 lbs of Hydrogen, and 7.43 lbs of oxygen.Therefore since hydrogen burned or in, equals hydrogen out after combustion, therefore 1.4 lbs of hydrogen burned, equals 1.4 lbs of hydrogen in the H20 or water created in combustion. By weight, 1.4 lbs of hydrogen divided by the weight of .92 lbs of hydrogen in water, equals 1.52. So 1.4 lbs of hydrogen in 1 gallon of gasoline, is converted to more gallons of water because gasoline contains more hydrogen per gallon, then does water. gallon is a measure of volume. one gallon of anything including water is still one gallon of that same thing. One US gallon of water = about 3.785 litersOne UK gallon of water = about 4.546 liters  Since mass of one gallon of Jello is essentially the mass of one gallon of water, the answer is: the mass of one gallon of water or 8.35 lbs.   1 gallon of fresh water is about 8.36 pounds    3.7854 liters of water make one US gallon. Deuterium oxide -- or "heavy water" -- is composed of water molecules formed by two deuterium atoms and one oxygen atom. Deuterium is a stable isotope of hydrogen containing one proton and one neutron in its nucleus. The more common hydrogen atom contains no neutrons in its nucleus. Heavy water is about 10 percent denser than regular water. Its specific gravity is 1.106. Since regular water weighs 8.34 pounds per gallon, a gallon of heavy water, therefore, weighs 9.22 pounds.  According to "How much does one gallon of water weigh?", a gallon of water weighs approx 8.35lb. Given that sperm is mostly water, It would weigh approximately 8.35lb.   One gallon of pure water would weigh about 20 (19.7) pounds on planet Jupiter. On Earth, one gallon weighs 8.345lbs. 8.35 lb , the weight of one gallon of water , more than previously .  4,54609188 kilograms There are 4,54609188 litres in an imperial gallon, one litre of water weighs 1 kilogram. Weight of 1 US Gallon of water = approx. 8.35 lb A ton is a measure of weight and a gallon is a measure of volume. You can't convert them as stated. If the gallon was water, you could say how much of a ton is in a gallon of water. One US gallon is equal to 3.785 liters. Because water weighs 1 kilogram per liter, one US gallon of water weighs 3.785 kilograms, or 3,785 grams.

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