H2 + S → H2S (hydrogen sulfide)H2 + Na → NaH (sodium hydride)H2 + Fe3O4 → 3Fe + 2H2O (iron and water)
H2 + S → H2S (hydrogen sulfide)
H2 + Na → NaH (sodium hydride)
H2 + Fe3O4 → 3Fe + 2H2O (iron and water)