How many moles does 3.16 x 1024 molecules of O2 make up?

can you list the answers so i can answer

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.

c. electrical charges of ionic bonds.

i believe the answer is three water molecules