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8400 is a pure number, with no units associated so it is impossible to answer the question in a sensible way. 0.84 m is very much smaller than 8400 kilometres but very much larger than 8400 nanometres!
enough to cover it
A hectare is 10,000 square meters of land.
8400 TO 8730 Kilos per cubic meter depending on what alloy it is.
1000 square feet of sod, or 111 square yards