1. What is Initial Concentration of Reactant in Zero Order Reaction followed by First Order Reaction?

Definition: This calculator determines the initial concentration of a reactant in a series reaction where the first step follows zero-order kinetics and the subsequent step follows first-order kinetics.

Purpose: It helps chemical engineers and researchers understand reaction kinetics and predict reactant concentrations over time.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( C_{A0} \) — Initial concentration of reactant (mol/m³)
• \( C_A \) — Current reactant concentration (mol/m³)
• \( k_0 \) — Rate constant for zero-order reaction (mol/m³·s)
• \( \Delta t \) — Time interval (s)

Explanation: The formula calculates the initial concentration by adding the product of the zero-order rate constant and time interval to the current concentration.

3. Importance of Initial Concentration Calculation

Details: Accurate determination of initial reactant concentration is crucial for reaction rate studies, process optimization, and reactor design.

4. Using the Calculator

Tips: Enter the current reactant concentration, zero-order rate constant, and time interval. All values must be ≥ 0.

5. Frequently Asked Questions (FAQ)

Q1: What is a zero-order reaction?
A: A reaction where the rate is independent of the reactant concentration.

Q2: How is this different from first-order kinetics?
A: First-order reaction rates depend on reactant concentration, while zero-order rates are constant.

Q3: What are typical units for k₀?
A: The rate constant for zero-order reactions typically has units of mol/m³·s or M/s.

Q4: When would I need this calculation?
A: When analyzing reaction kinetics where the mechanism changes order or for series reactions.

Q5: Does temperature affect this calculation?
A: Yes, temperature affects the rate constant (k₀), which should be determined at the relevant temperature.