Answer to Question #342568 in General Chemistry for lea

Question

What unit is used to describe reaction rate?

Answer 1

The rate of a reaction is the change in the concentration of the reactants (or products) per unit time. If time is denoted by t (sec or min) and the concentration of a substance is denoted by C (mol / l), the reaction rate is

V = ∆C / ∆t, and the unit of measurement is mol/(l * sec) ; (mol/l) / sec ; mol/(l * min) ;

(mol/l) / min and others.

If the reaction takes place in a homogeneous system, that is, between substances in the same aggregate state, the reaction rate is expressed in the above units.

If the reaction takes place in a heterogeneous system, that is, between substances in different aggregate states (gas-solid; solid-liquid), the gas interacts with the substance only through the surface. In expressing the unit of such reaction rate, the surface area of ​​the solid is taken into account and measured in

mol / (m² * sec).

ANSWER: mol/(l * sec) or mol/(m² * sec).