Class 12 Chemistry Chemical Kinetics Instantaneous rate of reaction

Instantaneous rate of reaction

The ratio of change in concentration in chemical reaction  to the time period is termed as instantaneous rate of the reaction.

-d[R]/dt = change in chemical concentration over short period of time/ the short time elapsed = (mol/litre) / time

 It can be calculated from the slope of the tangent on a concentration- time graph.

For example, consider the following graph.

The rate of reaction at t = 40s in the above graph can be calculated by following method:

Rate of reaction = gradient of the tangent at 40s = (120-70)/(65-5) = 50/60= 0.83 cm3s-1

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