## Different Types of Rate Laws

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

Letty Liu 2C
Posts: 105
Joined: Fri Aug 09, 2019 12:16 am

### Different Types of Rate Laws

What's the difference between differential and integrated rate laws? When do we have 2k as a constant instead of just k?

Myka G 1l
Posts: 100
Joined: Fri Aug 30, 2019 12:17 am

### Re: Different Types of Rate Laws

Differential rate laws describe the change in reactant or product concentrations as a function of time. Integrated rate laws describe the actual concentrations of reactants or products as a function of time. The only 2k I can think of is for the half life equation of a zero order reaction which is [A]o/2k.

805303639
Posts: 50
Joined: Thu Jul 11, 2019 12:16 am
Been upvoted: 1 time

### Re: Different Types of Rate Laws

Differential rate laws express the instantaneous rate of a reaction as a function of reactant concentrations. Integrated rate laws express the concentration of reactant remaining as a function of time. You'll have 2k as a constant if you solve for the rate of consumption/formation of a particular species with a stoichiometric coefficient of 2. This results from the algebraic rearrangement of d[A]/(a dt) = k [A]^n to d[A]/dt = a*k [A]^n.