Here's why there's a range:

* Density of Rock Salt: Rock salt (sodium chloride) has a density of around 2.16 g/cm³. However, the density can vary slightly depending on the size and shape of the salt crystals.

* Packing Density: The way the salt is packed in the pail influences the overall weight. Loosely packed salt will weigh less than tightly packed salt.

* Moisture Content: Rock salt can absorb moisture from the air, which adds to the weight.

Therefore, it's best to check the specific weight information on the pail itself or contact the manufacturer for the exact weight.