What is the empirical formula of a compound that is made of 3.80g of phosphorus and 0.371g of hydrogen?

You start by diving each quantity given by the atomic wight of each element:

Phosphorus (P)  

Hydrogen (H)  

Then you divide by the lowest number:

for phosphorus

for hydrogen

So the empirical formula will be:    

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).