1. What is Equilibrium Vapour Density?

Definition: Equilibrium Vapour Density is the density of a vapour substance during the stages of reaction at equilibrium.

Purpose: It helps chemists and researchers understand the state of gaseous substances when chemical equilibrium is reached.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( d \) — Equilibrium Vapour Density
• \( D \) — Initial Vapour Density
• \( \alpha \) — Degree of Dissociation (0 to 1)
• \( N_{moles} \) — Number of Moles

Explanation: The formula accounts for how the initial vapour density changes as molecules dissociate and reach equilibrium.

3. Importance of Equilibrium Vapour Density

Details: Understanding equilibrium vapour density is crucial for studying chemical equilibria, reaction kinetics, and gas phase reactions.

4. Using the Calculator

Tips: Enter the initial vapour density, degree of dissociation (default 0.35), and number of moles (default 2). All values must be positive.

5. Frequently Asked Questions (FAQ)

Q1: What is degree of dissociation?
A: It's the fraction of molecules that dissociate into smaller components, ranging from 0 (no dissociation) to 1 (complete dissociation).

Q2: How does number of moles affect the result?
A: More moles means more potential dissociation products, leading to greater changes in vapour density at equilibrium.

Q3: What are typical values for initial vapour density?
A: This depends on the specific gas, but values typically range from 1-500 g/L depending on molecular weight and conditions.

Q4: When would I need to calculate this?
A: When studying reversible gas-phase reactions or when you need to determine the extent of dissociation at equilibrium.

Q5: How does temperature affect the result?
A: Temperature affects both the degree of dissociation and vapour density, but this calculator assumes constant temperature conditions.