Please answer, I don't want to waste more points. ¿What's the answer to this Periodic Table question?

One of the following properties was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version. which property fits this description?

Aspirin has a density of 1.40 g/cm3 what is the volume in cubic centimeters of a tablet weighing 320 mg ?

What type of reaction fuels the processes seen here?