Describe how gold can be separated from a mixture of sand and dirt. What characteristic property of gold allows it to be separated in this way?

A5.000 g sample of niso4 h2o decomposed to give 2.755 g of anhydrous niso4. what is the formula of the hydrate? what is the full chemical name for the hydrate? what is the molar mass of the hydrate? niso4•_h2o what is the mass % of water in the hydrate?

Ineed ! i have no clue how to do this problem.

What causes most sediment to wash or fall into a river