## a value

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

Rebecca Doan 2L
Posts: 51
Joined: Thu Jul 27, 2017 3:01 am

### a value

I am still confused how to determine/calculate the a value of a reaction. can someone please explain this to me?

Max Mazo 2C
Posts: 30
Joined: Fri Sep 29, 2017 7:06 am

### Re: a value

Are you talking about a as in - $\frac{1}{a}\frac{d[A]}{dt}$ ? That a would be the molar coefficient of reactant A.

Anna Li 2E
Posts: 21
Joined: Sat Jul 22, 2017 3:00 am

### Re: a value

Going with what Max said, an example of this would be for the balanced equation 2H2+O2 --> 2H2O the 'a' value for for hydrogen for this example would be 2.

Sophie Krylova 2J
Posts: 59
Joined: Fri Sep 29, 2017 7:06 am

### Re: a value

In the context of a problem if you're, for instance, given the rate, and d[]/dt of reactant/product X and at least one other d[]/dt and asked to find a in aX, you can multiply d[]/dt by its coefficient and then divide by d[]/dt of X to find a. (But that's an unlikely scenario)