Answer

1 mole of a substance = 1 gram atom

 

In this case

H 2 S has 2 H atoms and 1 S atom

 

1 mole of H 2 S → 2 gram atoms of H and 1 gram atom of S

 

So, 0.4 moles of H 2 S →

2 x 0.4 = 0.8 gram atoms of H

1 x 0.4 = 0.4 gram atoms of S

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Maninder Singh

CA Maninder Singh is a Chartered Accountant for the past 14 years and a teacher from the past 18 years. He teaches Science, Economics, Accounting and English at Teachoo