 # WHAT IS RATE OF REX  Askiitians_Expert Yagyadutt
12 years ago

hII ANIL

The reaction rate or rate of reaction for a REACTANT or PRODUCT in a particular REACTION is intuitively defined as how fast or slow a reaction takes place. For example, the OXIDATION of iron under the atmosphere is a slow reaction which can take many years, but the combustion of butane in a fire is a reaction that takes place in fractions of a second.

So mathematically rate of reaction is expressed as...

Consider a typical chemical reaction:

aA + bB → pP + qQ

The lowercase letters (a, b, p, and q) represent stichiometric co-efficient, while the capital letters represent the reactants (A and B) and the products (P and Q).

The reaction rate r for a chemical reaction occurring in a closed system under constant-volume conditions, without a build-up of reaction intermediate, is defined as: $r = - \frac{1}{a} \frac{d[A]}{dt} = - \frac{1}{b} \frac{d[B]}{dt} = \frac{1}{p} \frac{d[P]}{dt} = \frac{1}{q} \frac{d[Q]}{dt}$,

I hope you get it

regards
Yagya