The units of the rate of a chemical reaction depend on the specific rate expression or rate law for that reaction. The rate of reaction is typically expressed as the change in concentration of a reactant or product per unit time.
Here are some common units for the rate of reaction:
Molarity per second (M/s): This unit is commonly used when expressing the rate of a reaction based on the change in concentration of a reactant or product per unit time, where concentration is measured in moles per liter (M) and time is measured in seconds (s).
Moles per liter per second (mol/(L·s)): This unit is equivalent to Molarity per second (M/s) and is used when expressing the rate in terms of the change in concentration per unit time.
Grams per second (g/s): In some cases, the rate of reaction may be expressed in terms of the change in mass of a reactant or product per unit time, where mass is measured in grams (g) and time is measured in seconds (s).
It is important to note that the specific units of rate will vary depending on the stoichiometry and order of the reaction. The rate expression and associated units can be determined experimentally or deduced from the balanced chemical equation and the rate law of the reaction.