1. What is Number of Moles at Equilibrium?

Definition: This calculator determines the number of moles of substances present at equilibrium in a chemical reaction involving dissociation.

Purpose: It helps chemists and students understand the quantitative aspects of chemical equilibrium and dissociation processes.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( n_{eq} \) — Number of moles at equilibrium
• \( \alpha \) — Degree of dissociation (between 0 and 1)
• \( N_{moles} \) — Initial number of moles

Explanation: The formula accounts for the fraction of molecules that dissociate (α) and how this affects the total number of moles in the system at equilibrium.

3. Importance of Equilibrium Moles Calculation

Details: Calculating moles at equilibrium is crucial for understanding reaction yields, equilibrium constants, and predicting reaction outcomes.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: What does degree of dissociation mean?
A: It's the fraction of molecules that break apart into smaller components (dissociate) in the reaction.

Q2: What's a typical value for degree of dissociation?
A: It ranges from 0 (no dissociation) to 1 (complete dissociation), depending on the substance and conditions.

Q3: Why does the number of moles change at equilibrium?
A: When molecules dissociate, they produce more particles, increasing the total number of moles in the system.

Q4: How is this related to equilibrium constant?
A: The equilibrium moles are used to calculate concentrations, which are then used to determine the equilibrium constant (K).

Q5: Can this be used for any dissociation reaction?
A: Yes, as long as you know the degree of dissociation and initial moles, this formula applies to any dissociation process.