Rate of a reaction

The rate (speed or velocity) of a reaction is the change in concentration in per unit time. 

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  

         · For the reaction which is 

         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

         · 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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