Oxygen can be converted into ozone by the action of lightning or electric sparks

Question

Oxygen can be converted into ozone by the action of lightning or electric sparks: 3O_2(g) 2O_3(g) For this reaction delta H = +68 kcal/mol (+285 kJ/mol) and K = 2.68 times 10-29 at 25 degree C. (a) Is the reaction exothermic or endothermic? (b) Are the reactants or the products favored at equilibrium? (c) Explain the effect on the equilibrium of (1) increasing pressure by decreasing volume. (2) increasing the concentration of O2(g). (3) increasing the concentration of O3(g). (4) adding a catalyst. (5) increasing the temperature.

Explanation / Answer

a)

the reaction is most likely endothermic, since dH is positive, meaning it requires heat fo form, dH is positive

b)

this favours strongly reactants, since the K << 1

c)

effect of equilibrium

i) increasing P, favours least mol formation, so O3 is favoured

ii) increasing O2 will favour more O3

iii) increase of O3, will favour O2

iv) addition of catlayst will only increase rate but equilibrium is the same

v) incrasing T will favour O3 since it is endothermic

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