That would also depend on its thickness. In general, for any given material, the mass (and therefore the weight) depends not on its surface area, but on its total volume.
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a square foot of lead has no weight since it has no thickness
what is the weight per square foot of 22 ga. corten?
The density of a substance is usually measured in weight units per volume (for example, per cubic foot), not per area. For a square foot... it would depend how thick the slab of granite is. That may vary between different manufacturers.
The answer will depend on 4 inch slab of what material!
144 square feet