Chemistry Practice Problems Average Rate of Reaction Practice Problems Solution: Ozone decomposes to oxygen according to the equati...

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Solution: Ozone decomposes to oxygen according to the equation 2O3 (g) ⟶ 3 O2 (g). Write the equation that relates the rate expressions for this reaction in terms of the disappearance of O3 and the formation of oxygen.

Problem

Ozone decomposes to oxygen according to the equation 2O3 (g) ⟶ 3 O2 (g). Write the equation that relates the rate expressions for this reaction in terms of the disappearance of O3 and the formation of oxygen.

Solution

We’re being asked to write the rate expression in terms of a) the rate of disappearance of O3 and b) rate of formation of O2 for the following reaction: 


2O3 (g) ⟶ 3 O2 (g).


Recall that for a reaction aA  bB, the rate of a reaction is given by:


Rate=-1aΔ[A]Δt=1bΔ[B]Δt


where:

Δ[A] = change in concentration of reactants or products (in mol/L or M), [A]final – [A]initial

Δt = change in time, tfinal – tinitial

a, b = stoichiometric coefficients from balanced equation


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