Which of the following is a valid mole ratio from the balanced equation 2C3H6 + 902 → 6CO2 + 6H20? (4 points)
1) 1 mol C3H6/2 mol CO2
2) 6 mol H2O/9 mol O2
3) 2 mol CH3H6/6 mol O2
4) 3 mol H2O/2 mol CO2

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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.