6 Uise the following potential energy iagram below to answer

6. Uise the following potential energy iagram below to answer questions: AB 100 EA-forward 80 PE 60 k)) 40AB A, reverse A+B 20 C+D Progress of the reaction a. is the overall reaction, as shown, exothermic or endothermic? b. what is the value of the sign. activation energy for the forward reaction? Be sure to include the appropriate what is the value of the activation energy for the reverse reaction? Be sure to include the appropriate sign. c. d. of the enthalpy change (AH) for t heforward reaction? Be sure to include the what is the value appropriate sign what is the value of the enthalpy change (Al) for the reverse reaction? Be sure to include the e. appropriate sign. f is the reverse reaction exothermic or endothermic? g. which species (or substance) forms the activated complex? h. which species or set of species has the highest energy? i. which species or set of species has the weakest bonds? j which species or set of species has the strongest bonds?

Solution

a) overall reaction is exothermic. because reaction product has less P.E. than product. delta H is negative i.e. exothermic.

b) Activation energy for forward reaction = 100-40

= +60 kJ

c) Activation energy for reverse reaction = 100- 80

=+20kJ

d) Enthalpy change for forward reaction = 20 - 40

= -20kJ

e) Enthalpy change for reverse reaction = 40 - 20

= +20kJ

f) reverse reaction is endothermic because delta H for reverse reaction is positive.

g) AB is activated complex

h) AB has highest energy because it unstable and also in the top of energy curve.

i) AB has the weakest bond.

j) C and D has the strongest bond because they are most stable among all.