How many moles are in 5.080x10^16 molecules of hydrogen

Moles of hydrogen = 5.08 x 10^16
                                 
                                   6.02 x 10^23
 
                               =     8.43 x 10^-8 moles.

That result from subduction of oceanic plates beneath lighter continental plates. most of the earth's volcanoes are located around the pacific ring of fire because that the location of most of the earth's subduction zones.

They carry out the exchange of gases as we breathe ( oxygen and carbon dioxide).