The compositions of mixtures vary but compounds have a what composition

The compositions of mixtures vary but compounds have constant definite composition. This is because all compounds follow the Law of Definite Proportions which states that all similar compounds will always have the same proportion of elements no matter where and how they are obtained. For example, carbon dioxide will always have 1 atom of carbon and 2 atoms of oxygen.

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Answer:

a. energy is absorbed in the reaction.

explanation:

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.