It's difficult to say for sure. Salt comes in different sizes of grains therefor you'd really have to have a solid chunk of salt that is exactly one gallon in size and weigh it to know for sure.
I've seen figures stating that 1 cubic yard of rock salt = 2160lbs
According to Google, 1 cu yard = 201.974 US gallons
So if 2160 lbs of Salt = 201.974 US Gallons then 2160/201.974 = 10.694 lbs/US Gal.
As stated above, this is not exact but will get you close. Hope this helps.
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100 grams pure water can hold about 38 grams of sodium chloride.(WikiAnswers)
Salt water is at it's lowest freezing point at a 23.3% salt-to-water solution. This works out to 2.28 lbs. of salt per gallon of water. Source: http://www.varitech-industries.com/pdfs/Salt%20Brine%20Statistics%20and%20Rock%20Salt.pdf
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8.556 pounds
how many pounds in a gallon
Salt water is at it's lowest freezing point at a 23.3% salt-to-water solution. This works out to 2.28 lbs. of salt per gallon of water. Source: http://www.varitech-industries.com/pdfs/Salt%20Brine%20Statistics%20and%20Rock%20Salt.pdf
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9.4 pounds per gallon