1. What is Boiling Point given Enthalpy using Trouton's Rule?

Definition: This calculator estimates the boiling point of a substance based on its enthalpy of vaporization using Trouton's rule.

Purpose: It helps chemists and engineers quickly estimate boiling points when enthalpy data is available.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( bp \) — Boiling point (Celsius)
• \( H \) — Enthalpy of vaporization (Joules)
• \( [R] \) — Universal gas constant (8.314 J/mol·K)

Explanation: Trouton's rule states that the ratio of enthalpy of vaporization to the boiling point is approximately constant for many liquids.

3. Importance of Boiling Point Calculation

Details: Knowing boiling points is crucial for designing chemical processes, distillation systems, and understanding substance behavior.

4. Using the Calculator

Tips: Enter the enthalpy of vaporization in Joules. The value must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is Trouton's rule?
A: It's an empirical rule stating that the entropy of vaporization is approximately the same for most liquids (about 85-88 J/mol·K).

Q2: How accurate is this calculation?
A: It provides a reasonable estimate but may vary by ±10% for many common liquids.

Q3: When does Trouton's rule not apply?
A: For highly polar liquids (like water) or liquids with hydrogen bonding, the rule may be less accurate.

Q4: Why is the constant 10.5 used?
A: This comes from Trouton's ratio (ΔHvap/Tb ≈ 88 J/mol·K) converted for the given units.

Q5: Can I use this for any substance?
A: Best for non-polar, non-associated liquids. For others, experimental data is preferable.