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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+.
What else can I help you with?
How much does a gallon of sperm weigh?
== Probably close to the weight of water. 8.34 lbs per gallon.
What does one hydrogen ion and one hydroxide ion make?
This combination produces water.Water molecules are consist of a hydrogen ion and a hydroxide ion. One hydrogen ion and one hydroxide ion combines to make a water mlecule.
What does 'H2o' stand for?
H2O = Hydrogen two oxygen, (two hydrogen atoms and one oxygen atom = one water molecule) which is the chemical formula for water.
How much does a gallon of bromine weigh?
Approximately 7.231 pounds The bulk density of table salt is 1.154 g/cm3. (http://en.wikipedia.org/wiki/Salt) One gallon is approximately 3785 cubic centimeters. Weight = Volume/Density=3785/1.154=3280. g [to four significant figures] There 453.6g per pound. So 3280.g=3280/453.6=7.231 pounds
Does water contain nitrogen carbon oxygen and hydrogen?
Water (H2O) contains hydrogen and oxygen, but does not contain nitrogen or carbon. Water is composed of two hydrogen atoms bonded to one oxygen atom. Nitrogen and carbon are found in other compounds, but not in water itself.
How much does One gallon of water equals what in pounds?
About 8.35 pounds for one US gallon of water.
How many grams of nitrogen in one gallon of pure water?
None. Pure water has only hydrogen and oxygen.
How much water is in 1 gallon bucket of snow?
one tenth of a gallon
How much oxygen gas can be produced by electrolysis of one gallon of water?
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.
How much water is produced while burning one gallon of gasoline?
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.
How much does gallon of water of weigh?
One gallon of water weighs about 8.35 pounds (about 3.8 kilograms).
How much water in a one gallon coolant mixture?
1/2 gallon ideally
How much does an imperial gallon of water weigh?
At 17oC one gallon of water weighs 4.536kg.
How much does a water gallon weigh?
A gallon of water weighs approximately 8.34 pounds (3.78 kilograms) at room temperature.
How much does1 gallon of water weigh?
One gallon of water weighs approximately 8.34 pounds (about 3.78 kilograms).
How much hydrogen adoms are in a water molecule?
One.
How much does one gallon of distill water weigh?
One gallon of distilled water weighs approximately 8.34 pounds at room temperature.
