If a gas at 300 K and 2.1 atm is heated, at what temperature does the
pressure become 4.0 atm?

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.

B? i feel like this is a trick  

The answer is neonhope it

Answer(28.02g/mol);