About 334 pounds for 40 US gallons.
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Gallons of what? Different substances have different weights, so you need to be specific. If it's water, then you need to specify if it's salt water or fresh water, since they don't weigh the same.
7.518 gallons.
Approximately 8.3 pounds.
About 8.53 pounds.
Depends on the density of the fluid (I assume). Gallon is a measure of volume and pounds is a measure of mass. A gallon of water will weigh far less than a gallon of say mercury.