1. What is Latent Heat of Vaporization?

Definition: The Latent Heat of Vaporization is defined as the heat required to change one mole of liquid at its boiling point under standard atmospheric pressure.

Purpose: This calculator helps determine the energy needed for phase change from liquid to vapor based on solvent properties.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( L_{vaporization} \) — Latent heat of vaporization (J/kg)
• \( [R] \) — Universal gas constant (8.314 J/mol·K)
• \( T_{bp} \) — Solvent boiling point (Kelvin)
• \( k_b \) — Ebullioscopic constant (K·kg/mol)

Explanation: The formula relates the boiling point elevation properties of a solvent to its latent heat of vaporization.

3. Importance of Latent Heat Calculation

Details: Knowing the latent heat is crucial for designing distillation systems, understanding phase change thermodynamics, and calculating energy requirements for industrial processes.

4. Using the Calculator

Tips: Enter the solvent boiling point in Kelvin and its ebullioscopic constant (default 0.512 K·kg/mol for water). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is the ebullioscopic constant?
A: It's a constant that relates molality to boiling point elevation for a particular solvent.

Q2: What units should I use?
A: Boiling point must be in Kelvin, ebullioscopic constant in K·kg/mol, and the result is in J/kg.

Q3: Can I use this for any solvent?
A: Yes, as long as you know its boiling point and ebullioscopic constant.

Q4: Why is the gas constant divided by 1000?
A: The factor of 1000 converts the result from J/g to J/kg.

Q5: What's a typical value for water?
A: For water at 373.15K, the latent heat is about 2,260,000 J/kg.