It depends on the powder. It is powdered sugar or powdered lead? One will be much much heavier than the other. You need to know the density of the powder to answer this question.
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Assuming the oz. you refer to are weight, 40 lbs. would yield 160 gallons mixture.
how many pounds in a gallon
How many pounds does a gallon of gas weigh
1 US gallon is 8.35 pounds
About 6.3 pounds per gallon.
10 pounds of water in an Imperial gallon
Approximately 3/4 US gallon. A US gallon of water weighs 8.35 pounds.
how many pounds of oats are in a 55 gallon drum
I have no idea, but a gallon of water weighs 8 pounds and a gallon of gas about 5
For gasoline, about 6.3 pounds per US gallon.
8 pounds of water in 1 US gallon
There are 6.33 pounds in a gallon of Mineral Spirits
Approx. 8 pounds, for an imperial gallon.
9.4 pounds per gallon
pounds is a measurement of weight. gallon is a measurement of volume
A gallon of honey weighs about 12 pounds.
A US gallon of liquid detergent is about 8.35 pounds
how many pounds in one half gallon of milk
That is 8 pounds
About 10 pounds