Name: reaction is the most exothermic? -23· The following energy profiles for en

Question

Name: reaction is the most exothermic? -23· The following energy profiles for energy profiles for four different reactions are shown. Which react prod. react Reaction path Reaction path prod. react prod Reaction path Reaction path a. a c. c b. b d. d 24. The mechanism for the reaction 2Hotag) 2H20() + 02(g) in the presence of I (aq) is proposed to be Step 1: H,02(ag) + Itag) H20(1) + 01(a) Step 2: H2O2(ag) + or(aq) H20(1) + Og(g) + raq) What is the rate law for the overall reaction? (slow) (fast) a. Rate KH,0,] b. Rate A(H 0,1 C. Rate-k[I401[I-]

Explanation / Answer

23. The correct answer is option a.

Explanation:

In an exothermic reaction, energy will be released, while in an endothermic reaction, energy will be gained.

i.e. In an exothermic reaction, the reactants usually have high energy, and they release some energy to form the products.

In the energy profile of reactions 'a' and 'c', the reactant has higher energy than the product, hence they are exothermic reactions.

In the energy profile of reactions 'b' and 'd', the reactant has lower energy than the product, hence they are endothermic reactions.

Now, the energy difference between the reactant and the product is more in reaction 'a' than in reaction 'c'.

Hence, more energy will be released in reaction 'a' than in reaction 'c'.

Therefore, out of given four reactions, reaction 'a' is the most exothermic, and reaction 'b' is the most endothermic.

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