Average Rate of Reaction Video Lessons

Concept:

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?

FREE Expert 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:

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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Problem Details

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?

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