How many pounds of salt per gallon of water?

Answer 1

Assuming the question is asking about Sea Water, the Wikipedia entry on "seawater" says "Seawateris water from a sea or ocean. On average, seawater in the world's oceans has a salinity of about 3.5% (35 g/L, or 599 mM). This means that every kilogram (roughly one litre by volume) of seawater has approximately 35 grams (1.2 oz) of dissolved salts...". So, to convert this to pounds and gallons, there are 3.78 liters per gallon and 16 ounces per pound. If I did the arithmetic correctly, that would be 0.28 pounds (4.5 oz) per gallon.