Consider the reaction where oxygen is converted into ozone by lightening: 3 O 2

ID: 808606 • Letter: C

Question

Consider the reaction where oxygen is converted into ozone by lightening:

3 O2 (g) ? 2 O3 (g) ?H = +68 kcal/mol and K = 2.68 x 10-29 at 25 degrees C

a) Is this reaction endothermic or exothermic?

b) Are the reactants of products favored at equilibrium?

c) What do you expect will happen to this system if the supply of O2 is suddenly decreased?

d) What do you expect will happen to this system if the pressure drops suddenly?

e) What do you expect will happen to this system if the temperature increases suddenly?

a) deltaH is positive hence endothermic

b) K is very less than 1 hence reactants favoured at equilibrium

c) since we decrease the reactant reaction will move so as to increase the reactant that is in backward direction(Le Chatellier)

d) increase in pressure shifts the reaction to where there are less moles

decrease in pressure takes it to where there are more moles there are 3 moles in reactant side and hence backward direction

e) since temp is increased and the reaction is endothermic(it requires heat), forward reaction will be encouraged

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