When iron (Fe) reacts with molecular oxygen (O2), a new compound is formed. This compound is the Fe2O3 found in rust. 4 Fe + 3 O2 → 2 Fe2O3

If 112 g of Fe combines with 48 g of O2, how much Fe2O3 is formed?
A. 48 g Fe2O3
B. 112 g Fe2O3
C. 88 g Fe2O3
D. 160 g Fe2O3

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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.