1. What is Vapour Density at Equilibrium?

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

Purpose: It helps chemists and chemical engineers understand the state of a chemical reaction at equilibrium and predict product formation.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( d \) — Equilibrium Vapour Density
• \( D \) — Initial Vapour Density
• \( n_{initial} \) — Initial Number of Moles (mol)
• \( M \) — Total Moles at Equilibrium (mol)

Explanation: The initial vapour density is multiplied by the initial moles and then divided by the total moles at equilibrium to determine the equilibrium vapour density.

3. Importance of Vapour Density Calculation

Details: Calculating vapour density at equilibrium is crucial for understanding reaction progress, determining molecular weights, and predicting reaction yields.

4. Using the Calculator

Tips: Enter the initial vapour density, initial number of moles, and total moles at equilibrium. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is vapour density?
A: Vapour density is the density of a vapour relative to that of hydrogen under the same conditions.

Q2: Why is equilibrium vapour density important?
A: It helps determine the extent of reaction and the composition of the equilibrium mixture.

Q3: How do I measure initial vapour density?
A: Initial vapour density can be measured experimentally or calculated from known properties of the reactants.

Q4: What affects the equilibrium vapour density?
A: Temperature, pressure, and the nature of the chemical reaction all affect the equilibrium vapour density.

Q5: Can this calculator be used for any chemical reaction?
A: It's primarily designed for gas-phase reactions where vapour density measurements are applicable.