Rank the substances in the figure from least atoms per mole to most atoms per mole. 
A) SiO2 < C2H6 < CO2 < Fe
B) C2H6 < SiO2 = CO2 < Fe
C) Fe < CO2 = SiO2 < C2H6
D) Fe < CO2 < SiO2 < C2H6
E) C2H6 < SiO2 < CO2 < Fe
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