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Stacked end to end I assume.

O=O

Also assume the bond has no length, as it is a double bond.

One oxygen atom has a radius of 73 picometers, or a diameter of 146 picometers, so two in the diatomic molecule have the diameter ( length ) of 292 picometers.

292 picometers/109

= 2.92 X 10 -7 meters per molecule

===========================so,

2.92 X 10 -7 meters per molecule (100 centimeters/1 meter)(1 inch/2.54 centimeters)(1 foot/12 inches)

= 9.58 X 10 -7 feet per molecule

=======================and,

12000 feet/9.58 X 10 -7 feet per molecule

= 1.2526 X 1010 oxygen molecules in that distance

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