1. What is Molar Heat of Fusion?

The molar heat of fusion is the amount of energy required to change one mole of a substance from solid to liquid at its melting point without changing its temperature. For water, this value is 6010 J/mol.

2. How Does the Calculator Work?

The calculator uses the heat of fusion equation:

Where:

• \( Moles \) — Amount of substance in moles
• \( 6010 \) — Molar heat of fusion for water in J/mol

Explanation: The equation calculates the total energy required to melt a given amount of water at its melting point.

3. Importance of Heat of Fusion Calculation

Details: Calculating heat of fusion is important in thermodynamics, phase change studies, and engineering applications involving melting or freezing processes.

4. Using the Calculator

Tips: Enter the amount of water in moles. The value must be positive (moles > 0).

5. Frequently Asked Questions (FAQ)

Q1: Why is the heat of fusion for water important?
A: It's crucial for understanding energy requirements in phase changes, important in climate studies, engineering, and biological systems.

Q2: What are typical values for other substances?
A: Different substances have different values (e.g., ethanol: 5020 J/mol, aluminum: 10700 J/mol).

Q3: How does this differ from heat of vaporization?
A: Heat of fusion is for solid-liquid transition, while vaporization is for liquid-gas transition (much higher for water: 40660 J/mol).

Q4: Does pressure affect heat of fusion?
A: Yes, but the effect is relatively small for moderate pressure changes.

Q5: Why is water's heat of fusion relatively high?
A: Due to hydrogen bonding between water molecules which requires significant energy to break during melting.