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### 15.3

Posted: Thu Mar 07, 2019 11:00 pm
Can someone explain this to me:

15.3 In 20. s, the concentration of nitrogen dioxide, NO2, decreases from 450 mmol/L to 320 mmol/L in the reaction 2 NO2(g) 2 NO(g) O2(g). (a) Determine the rate of reaction of NO2. (b) Determine the rate of formation of O2.
(c) What is the unique rate of the reaction?

### Re: 15.3

Posted: Thu Mar 07, 2019 11:03 pm
You use the average rate of rxn equation where you do -delta(R)/delta(t). And then you look at the coefficients to find the ratios and the rates of each compound.

### Re: 15.3

Posted: Fri Mar 08, 2019 10:03 am
Do you work backwards for part c? I am not sure what to do.
I have the rate of reaction of NO2, I know the coefficient of NO2 is 2.
Do I divide 6.5 x 10^-3 by 2? How does that give the unique rate of the whole reaction?

### Re: 15.3

Posted: Fri Mar 08, 2019 10:14 am
You do not need to work backward from part c. You can find the average change in rate (part a) by dividing the change in concentration by the change in time. Part B is asking about ratios of rates, which can be found by looking at stoich. coefficients. Thus, you can find part c based on these coefficients.