2A + B + 2C → D + E the following initial rate data were collected at constant temperature. Determine the correct rate law for this reaction. For this question, all units are arbitrary. Trial [A] [B] [C] Rate 1 0.230 0.150 0.350 0.0130 2 0.230 0.300 0.350 0.0520 3 0.345 0.150 0.350 0.0195 4 0.230 0.150 0.700 0.0130

20 drops hope this

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.  

yes the answer is total mass in unchanged   : )