Rate of a reaction
The rate (speed or velocity) of a reaction is the change in concentration in per unit time.
![1907_rate of reaction.png](https://www.expertsmind.com/../CMSImages/1907_rate of reaction.png)
where Δx or dx is the concentration change, which means x2-x1 in the time interval Δt or dt, which means t2-t1
Concentration is generally expressed in active mass, which is mole L-1
· The rate measured over long time interval is called as average rate and the rate measured for the infinitesimally small time interval is known as instantaneous rate and
Instantaneous rate ![625_rate of reaction1.png](https://www.expertsmind.com/../CMSImages/625_rate of reaction1.png)
· For the reaction which is ![952_rate of reaction2.png](https://www.expertsmind.com/../CMSImages/952_rate of reaction2.png)
The rate at which the reactant disappearance is negative in nature
The rate at which the A disappears
The rate at which B disappears
Rate of formation of the product is positive in nature
The rate of formation of C
The rate of formation of D
· Stoichiometric coefficient rate can be expressed as
![1575_rate of reaction8.png](https://www.expertsmind.com/CMSImages/1575_rate%20of%20reaction8.png)
· The reaction's rate is always positive in nature.
· The reduction is seen in the rate of chemical reaction as the reaction progresses.
· Unit of rate of a reaction = Unit of conc. / Unit of time=mole L-1 time -1
In the term of gaseous reaction unit can be defined as atm time-1 and
Rate in atm time-1= Rate in mole L-1time-1 * RT
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