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lead density is 0.41 pounds/cubic inch 1.68 x 0.41 = 0.688 pounds
The question cannot be answered. A square metre is a measure of area not of volume. A block of lead, with an area of 1 square metre could be a few atoms thick or several metres thick. Their weights will differ considerably.
Rocks vary greatly in density and weight. A piece of pumice that size could weigh maybe an ounce, while a lead-laden rock may weigh many times that, maybe closer to a pound.
1 cubic inch of lead has a weight of approx 13.11 pounds weight.
Since the steel weighs 1 lb (16 ounces) and the lead weighs 15 ounces, the steel is heavier.