The flux of oxygen molecules under these conditions is 3.58 x 1018 molecules m-2 s-1

Rationale

The flux is directly proportional to the pressure : consequently a decrease in pressure by 6 orders of magnitude (all other conditions remaining the same) leads to a corresponding decrease in the flux i.e.

F = 3.58x1024 x ( 10-6 / 1 )

⇒  F = 3.58 x 1018 molecules m-2 s-1

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