Chemistry Practice Problems Average Rate of Reaction Practice Problems Solution: The reaction 2NO(g) + O2 (g) → 2NO2 (g) is second ...

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Solution: The reaction 2NO(g) + O2 (g) → 2NO2 (g) is second order in NO and first order in O2. When [NO]= 4.1×10−2 M and [O2]= 3.6×10−2 M , the observed rate of disappearance of NO is 9.3×10−5 M/s .What is the rate of disappearance of O2 at this moment?

Problem

The reaction 2NO(g) + O2 (g) → 2NO2 (g) is second order in NO and first order in O2. When [NO]= 4.1×10−2 M and [O2]= 3.6×10−2 M , the observed rate of disappearance of NO is 9.3×10−5 M/s .

What is the rate of disappearance of O2 at this moment?

Solution

We’re being asked to determine the rate of disappearance of O2.


We are given the balanced equation for the reaction:

2 NO(g) + O2 (g) → 2 NO2 (g)


Recall that the average rate of a reaction is given by:


Rate = [A]time


where Δ[A] = change in concentration of reactants or products (in mol/L or M) and Δtime = change in time. We can simply do a rate-to-rate comparison based on the stoichiometric coefficients.

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