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First-order reaction may refer to:
- Order of reaction, in chemical kinetics, the power to which the concentration term of a certain reactant in the rate equation is raised
- Rate equation#First-order reaction, a reaction that depends on the concentration of only one reactant. Mathematically,
Solving the above differential equation, we get
From Arrhenius equation,
= time in seconds (s) = the concentration of the reactant (mol/m^3, other units are also used, e.g. kg/m^3) = the initial concentration of the reactant () = pre-exponential factor (1/s) = the activation energy (J/mol) = reaction rate constant (1/s) which is usually described by the Arrhenius equation: . = the universal gas constant (J/mol.K, K is temperature in kelvin not to be confused with little k, the reaction constant)
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