Why do 1 dm3 of both CO₂ and He have the same number of particles at RTP (in spite of the fact that CO₂ molecules are much bigger than He atoms) ?
a) Both CO₂ and He have the same atomic mass.
b) Both CO₂ and He have the same number of molecules or atoms in 1 dm3.
c) The sizes of the molecules or atoms do not affect the number of particles at RTP.
d) The density of both CO₂ and He is the same at RTP.