Answer:
Uh, the second one?
Explanation:
Try to restate the question please.
Answer: 3.35x10²³atoms H2
Explanation: solution attached:
Convert mass of Al to moles
Do the mole to mole ratio between Al and H2
Convert moles of H2 to atoms using Avogadro's number.
I'm not sure but i would say C.storing the heat energy.