The flux of oxygen molecules under these conditions is 3.58 x 1024 molecules m-2 s-1

Rationale

The incident flux is given by the following equation (with all quantities expressed in SI units).

    [ molecules m-2 s-1 ]

In this instance ,

  P = (1/760) x 101325 = 133.3 N m-2

and

  m = 32 x 1.66x10-27 = 5.32x10-26 kg

so

  F = 133.3 / (2 x 3.1416 x 5.32x10-26 x 1.38x10-23 x 300 )1/2

i.e.  F = 3.58 x 1024 molecules m-2 s-1

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