The flux of hydrogen molecules under these conditions is 7.83 x 1018 molecules m-2 s-1

Rationale

The flux is inversely proportional to the square root of the gas phase temperature - hence , by comparison with the previous result

F = 1.43 x 1019 x ( 300 / 1000 )1/2

⇒  F = 7.83 x 1018 molecules m-2 s-1

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