# 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?

🤓 Based on our data, we think this question is relevant for Professor Tyson's class at UMASS.

###### 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. ###### 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?