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`[A] = -k*t+[A_0]`

Enter a value for all fields

The **Zero-order Rate Law (integral form)** calculator computes the amount of reactant (concentration) at a certain point of time during a reaction.

**INSTRUCTIONS:** Choose units and enter the following:

**[A**Initial Concentration of Substance A_{0}]- (
**k**) reaction rate constant (units: mol/L*sec) - (
**t**) Duration of Reaction

**Amount of Reactant [A]:** The calculator returns the concentration of reactant in moles per liter (mol/L).

- Zero Order
**Rate Law (Integral form)** - Zero Order
**Half Life** - Zero Order
**Rate Law** - First Order
**Rate Law (Integral form)** - First Order
**Half Life** - First Order
**Rate Law** - Second Order
**Rate Law (Integral form)** - Second Order
**Half Life** - Second Order
**Rate Law**

The** zero-order rate law (integral form) ^{[1]}** equation calculates the amount of reactant at a certain point of time during the reaction. Remember that rate is a differential equation in mathematics and physics that can be integrated, a full integration of the differential form of zero-order can be found here. The zero-order rate law (integral form) equation is:

[A] = [A_{0}] - k⋅t_{[2]}

where

**[A]**= Amount of Reactant**[A**=_{0}]**initial concentration**of substance A in units of (mol/L)**k**=**rate constant**in units of (mol/L*sec)**t**= duration of the reaction in units of (sec)

- Khan Academy: Rate law and reaction order

[1]https://en.wikipedia.org/wiki/Rate_equation

[2]Whitten, et al. 10th Edition. Pp. 626,629,631

[Picture]http://chemwiki.ucdavis.edu/Core/Physical_Chemistry/Kinetics/Reaction_Rates/Zero-Order_Reactions