A student has an unknown sample. How can spectroscopy be used to identify the sample? It can identify the elements in the sample. It can determine the number of electrons in the sample. O It can determine the ratio of the elements in the sample. It can determine the molecular structure of atoms in the sample.

fe 55.85 g/mol and h2o 18.02 g/mol.

lol for the pointsss

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.