1. What is Number of Moles at Equilibrium?

Definition: This calculator determines the total number of moles of a substance present at chemical equilibrium based on initial moles and degree of dissociation.

Purpose: It helps chemists and students understand and predict the composition of chemical systems at equilibrium.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( n_{total} \) — Total moles in reaction at equilibrium (moles)
• \( N_{moles} \) — Initial number of moles of substance
• \( \alpha \) — Degree of dissociation (between 0 and 1)

Explanation: The initial moles are multiplied by the degree of dissociation to find the actual moles present at equilibrium.

3. Importance of Equilibrium Calculations

Details: Understanding equilibrium composition is crucial for reaction yield predictions, industrial process optimization, and laboratory experiments.

4. Using the Calculator

Tips: Enter the initial number of moles and degree of dissociation (between 0 and 1). The degree of dissociation represents the fraction of substance that dissociates.

5. Frequently Asked Questions (FAQ)

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

Q2: How do I determine the degree of dissociation?
A: It can be determined experimentally or calculated from equilibrium constants for known reactions.

Q3: Does this work for all chemical reactions?
A: This formula applies specifically to dissociation reactions where one molecule splits into smaller components.

Q4: What's the difference between initial and equilibrium moles?
A: Initial moles are what you start with before reaction, equilibrium moles are what remain after the reaction reaches balance.

Q5: Can the degree of dissociation be greater than 1?
A: No, it represents a fraction and must be between 0 and 1. Values greater than 1 are physically meaningless.