Rate Constant Formula:
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Definition: This calculator determines the rate constant for a third-order irreversible reaction involving two reactants with different concentrations.
Purpose: It helps chemists and chemical engineers analyze reaction kinetics and design chemical reactors.
The calculator uses the formula:
Where:
Explanation: The reaction rate is divided by the product of reactant A concentration and the square of reactant B concentration.
Details: Accurate rate constants are essential for predicting reaction behavior, designing reactors, and optimizing chemical processes.
Tips: Enter the reaction rate in mol/m³·s, concentrations of both reactants in mol/m³. All values must be > 0.
Q1: What makes a reaction third-order?
A: A reaction is third-order when the sum of the exponents in the rate law equals 3 (here 1 for A + 2 for B = 3).
Q2: What units does the rate constant have?
A: For this third-order reaction, the units are m⁶/mol²·s.
Q3: Can I use concentrations in different units?
A: Yes, but you'll need to adjust the calculation to maintain consistent units throughout.
Q4: How do I determine the reaction rate?
A: The reaction rate is typically determined experimentally by measuring concentration changes over time.
Q5: What if my reactants have equal concentrations?
A: The formula simplifies when CA = CB, but this calculator handles the general case of unequal concentrations.