Which of the following reactions results in a decrease in entropy? 2so2 (g) + o2 (g) yields 2so3 (g) 2nh3 (g) yields n2 (g) + 3h2 (g) 2h2o2 (aq) yields 2h2o (l) + o2 (g) nahco3 (aq) + hcl (aq) yields nacl (aq) + h2o (l) + co2 (g)

Option (a) is the correct answer.

Explanation:

Entropy is defined as the degree of randomness of a substance.

For example, gases have more entropy as compared to liquids because molecules a gas have more kinetic energy due to which they move rapidly.

Also, when more number of moles are formed a chemical reaction then it means entropy has increased. But when there are less number of moles formed then it means there is a decrease in entropy.

Thus, we can conclude that the reaction results in a decrease in entropy as 3 moles is giving 2 moles.

the answer is 1 i believe

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.