Assuming that air is breathed at an average rate of 4.35 L/min (25 ∘C; 735 mm Hg) and that the concentration of CO2 in expelled air is 3.4 % by volume, how many grams of CO2 are produced in 11 h ?

what is the question here. i think you messed up.

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

explanation:

originally atomic mass was used to arrange elements on the periodic table from left to right in a row. each column then shows similar properties of elements of a group.

in modern periodic table, the atoms are arranged in increasing atomic number. as atomic number represents the number of protons in an atom which is unique for every atom.