Question

Consider the reaction pathway graph below.

Which inference is supported by evidence in the graph?
A and C show that the reaction enthalpy is less than the activation energy.
G and E show that this reaction is an endothermic process with heat release.
B and F show that the activated complex has less energy than the reactants.
E and D show that the energy of the products is less than that of the reactants.

Answer 1

Answer: the fourth option: E and D show that the energy of the products is less than that of the reactants.


Step-by-step explanation:


The graph shows how the energy of the species (vertical axis) changes as the reaction progress (horizontal axis).


We can see each option:


1) A and C show that the reaction enthalpy is less than the activation energy.


FALSE: C is the energy difference between products and reactants, and that is the enthalpy of the reaction, while C is the activation energy (the peak of the curve).


2) G and E show that this reaction is an endothermic process with heat release.


FALSE: since G is below E, the final energy is less than the initial energy, meaning that the reaction released energy and, consequently, the reaction is exhotermic.


3) B and F show that the activated complex has less energy than the reactants.

FALSE
The activated complex is at the peak of the curve, so it hass more energy than the reactants.


4) E and D show that the energy of the products is less than that of the reactants.

TRUE: indeed D is below E meaning the the energy of the products (D) is less than the energy of the reactants (E).

Answer 2

Correct Answer: option 4: E and D show that the energy of the products is less than that of the reactants.

Reason:
For the reaction: Q + R → N + M
(reactant) (product)

From the graph, it is clearly evitable that E represent energy of reactant, while D represents energy of products. Also, value of D is less as compared to E. This signifies that, products (N+M) has less energy as compared to reactants (Q+R). Also, the reaction is exothermic in nature.