## Using Average rate of one molecule for another

$aR \to bP, Rate = -\frac{1}{a} \frac{d[R]}{dt} = \frac{1}{b}\frac{d[P]}{dt}$

005115864
Posts: 64
Joined: Fri Sep 28, 2018 12:15 am

### Using Average rate of one molecule for another

Can someone explain to me how I can use the average rate to go from the production of one molecule to the consumption of another? For example,

In the textbook, the example given is N2 + 3H2 > 2NH3

We are given that the average rate of rxn is 1.15 mmol/L*H NH3. a) How can I used this to find the consumption rate of H2? b) Then, how can I find the unique rate using that?

The answer key says its a) 1.72 mmol/L*H H2
b)0.575 mmol/L*h

Jane Burgan 1C
Posts: 73
Joined: Fri Sep 28, 2018 12:15 am

### Re: Using Average rate of one molecule for another

To find the consumption rate of H2, you multiply the average rate of the reaction by 3/2, because the reaction rate has been based on creating 2 mols of NH3, but you need to find the consumption rate of 3 mols of H2. To find the unique reaction rate, you divide the average reaction rate (1.15) by 2 because the average rate was based on creating 2 mols of NH3.