## Rate of formation/consumption

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

manasa933
Posts: 72
Joined: Fri Sep 29, 2017 7:04 am

### Rate of formation/consumption

When calculating the rate of formation/consumption, do we take the concentrations of the reactants or products or both?

Hannah Guo 3D
Posts: 56
Joined: Fri Sep 29, 2017 7:06 am

### Re: Rate of formation/consumption

When calculating the rate of consumption/formation, I think we only look at the concentration change of a single reactant or product and then divide that by the time it takes to make the change.

Hope it helps!

Ishita Monga 1B
Posts: 31
Joined: Thu Jul 27, 2017 3:00 am

### Re: Rate of formation/consumption

It depends on whether you're looking at the rate of consumption/formation of a specific species or the unique rate of reaction. If you're trying to find the unique rate of reaction it doesn't matter what species you use as long as you divide by the coefficient and use the proper sign depending on if you consider a reactant or a product.

Nora Sharp 1C
Posts: 53
Joined: Sat Jul 22, 2017 3:00 am

### Re: Rate of formation/consumption

The rate of formation generally refers to one of the products (d[B]/dt, for example). The rate of consumption is the rate at which one of the reactants is being consumed at the beginning of the reaction. If you divided the rate of consumption and formation by the coefficients of the compounds the rates correspond to, you'd get the unique rate, which is the same value for every reactant and product in the reaction.