10 pounds weight
2 quarts
One US gallon of water = about 3.785 liters One UK gallon of water = about 4.546 liters
One and Three Quarters Gallons = 1.75 Gallons = 7 Quarts
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...