The question cannot be answered sensibly. The weight of an object depends on its volume and volume depends on the length, breadth and height of the object. Given only the length it is impossible to give an answer. It would, for example, be impossible to distinguish between 12 inches of a steel wire and 12 inches of a steel block!
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TO answer this question, you need to know the density and the volume of the piece of steel. For example, "mild steel" weighs .284 pounds per cubic inch. The volume of a 12 inch x 12 inch x 1 inch piece of steel is 12 * 12 * 1 = 144 cubic inches. .284 pounds/inch^3 * 144 inch^3 = 40.896 pounds. So each of these steel tiles will weigh about 41 pounds.
The weight (not mass) is 69.05 pound weight.
12 inches in a foot, so, 12 * 25 =300 inches
12 feet, 8 inches
You can't weigh 5 foot 5 inches, that is a measurement of your height not your weight.