The flux of hydrogen molecules under these conditions is 1.43 x 1019 molecules m-2 s-1

Rationale

The flux is inversely proportional to the square root of the mass of the incident gas species - hence, using the answer obtained for oxygen at this pressure as a starting point

F = 3.58x1018 x ( 32 / 2 )1/2

⇒  F = 1.43 x 1019 molecules m-2 s-1

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