None, since there can be no conversion.
A cubit foot (=1.5 square feet) is a measure of area in 2-dimensional space whereas a pound is a measure of mass or a currency unit. The two measure different things and, according to basic principles of dimensional analysis, any attempt at conversion from one to the other is fundamentally flawed.
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It is not clear what you mean by "5x5x1 sq feet". If all three are measures of length then they are cubic feet, Alternatively, they are 5x5 = 25 plots of 1 sq ft each. You must learn to check for dimensional consistency and to use measurement units every time to avoid this sort of ambiguity.
that is 333 cubic feet,or 12.3 cubic yards At 100 pounds per cubic foot,that is over 33,000 pounds of gravel
Granite weighs an average of about 20 pounds per square foot, so a 5' by 8' (40 square feet) piece of granite would weigh approximately 800 pounds.
One ton is a unit of weight. Square Feet is a unit of space. You cannot convert the two without knowing more information such as a tone of what will cover such and such square feet, a ton of insulation will cover this much square feet to this depth. etc...
280 square feet.