A 500 mL sample of drinking water contains 0.001 mg of mercury. How many ppb is this?

The value is  

Explanation:

From the question we are told that

   The volume of the drinking water is  

   The mass of  mercury it contains  

Generally the mass of water is mathematically represented as

Here is the  density of water with value  

So

=>    

Generally  ppb mean part per billon ,  and  1 billon is  100,000,000

So the part per billon which this represents is mathematically represented as

=>    

answer is: naturally occurring solid, inorganic compound or element is mineral.

minerals usually have crystalline form, that means than crystal constituents (atoms, molecules or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions.

for example magnetite is a mineral of iron oxide (fe₂o₃).

calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (caco₃).

dolomite is an   carbonate mineral composed of calcium magnesium carbonate (camg(co₃)₂).