That is 640 ounces
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An ounce is a unit of weight which is approximately equal to 28 grams. One gallon is equal to 128 ounces so there are 640 ounces in 5 gallons of water.
There are 640 ounces in 5 gallons. Each gallon contains 128 ounces. So, 5 gallons would be 5 multiplied by 128, which equals 640 ounces.
To calculate the amount of chemical needed per gallon, first determine the total amount of chemical in the 5 gallons of water. Since 16 ounces in 5 gallons equal 500 ppm, you can set up a proportion: (16 ounces/5 gallons) = (x ounces/1 gallon). Solve for x to find out how many ounces of chemical are needed per gallon.
That is approximately 14.37 5 gallons
(67.6 fluid ounces) / (128 fluid ounces per gallon) = 0.528125 gallon