How many parts per million of sulfur dioxide are there in a 12,000 g aqueous solution containing 0.095 g of sulfur dioxide?

Hello thereone 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? answer: atomic mass  was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.

1) according to the law of conservation of mass ,in all chemical reactions total mass is unchanged

Ithink that one is (c)