1. What is Vapour Density at Equilibrium?

Definition: This calculator determines the equilibrium vapour density of a substance during chemical reaction based on initial conditions and degree of dissociation.

Purpose: It helps chemists and chemical engineers understand how vapour density changes as a reaction reaches equilibrium.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( d \) — Equilibrium Vapour Density
• \( D \) — Initial Vapour Density
• \( C_0 \) — Initial Concentration (mol/m³)
• \( \alpha \) — Degree of Dissociation

Explanation: The formula accounts for how the vapour density changes as molecules dissociate during the reaction.

3. Importance of Equilibrium Vapour Density

Details: Understanding vapour density at equilibrium is crucial for reaction kinetics, industrial process design, and safety calculations.

4. Using the Calculator

Tips: Enter the initial vapour density, initial concentration in mol/m³, and degree of dissociation (0-1 range). All values must be ≥ 0.

5. Frequently Asked Questions (FAQ)

Q1: What is degree of dissociation?
A: It's the fraction of reactant molecules that dissociate into products at equilibrium (ranges from 0 to 1).

Q2: How does initial concentration affect the result?
A: The initial concentration cancels out in the formula, but is included for dimensional consistency.

Q3: What units are used for vapour density?
A: Vapour density is typically unitless (relative to air or hydrogen), but depends on your reference standard.

Q4: Can I use this for any chemical reaction?
A: This applies specifically to reactions where vapour density changes due to molecular dissociation.

Q5: What if degree of dissociation is zero?
A: If α=0 (no dissociation), equilibrium vapour density equals initial vapour density.