What is true of diffusion

Five students had to answer the question how are elements arranged in a periodic tabledamon: i think the elements are arranged by increasing massflo: i think the elements are arranged according to their properties sienna: i think the elements are arranged by when their discovers kyle: i think the elements are arranged according to how common they areglenda: i don't agree with any of themwho is right

0.2348 grams of pbcl2 used to form 44.0 ml of solution.

What is the percent by mass of oxygen in fe2o3