A student reacts 13 moles of iron with 21 moles of oxygen according to the following equation: (picture goes here) How many moles of iron(III) oxide will the reaction produce? (Hint: Find the limiting reactant first.)

a
44 moles
b
6.5 moles
c
34 moles
d
13 moles

it should be all of them because it asks if you included all of those in your answer

explanation:

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.