Asap ! i don’t understand this at all.

well i think what you do first is that you would divide that number of amu by 6.02 x 10^23 and that will get you the number of moles of H2. once you have the number of moles you divide the number of moles by the molar mass of H2 and that should give you the grams. i’m trying to explain this as best as possible sorry if ur still confused.

geosphere and hydrosphere.

this is because the geosphere has to do with geological events, while the hydrosphere controls all water on earth.