A Sublimation Enthalpy Calculator is to determine the enthalpy of sublimation (ΔH_sub) of a substance. The enthalpy of sublimation represents the amount of energy required to convert a substance from a solid to a gas without passing through the liquid phase.

Sublimation Enthalpy Calculator

Formula Used in the Calculator

A formula for enthalpy in sublimation.

Where:

  • ΔH_sub = Enthalpy of sublimation (in kJ/mol)
  • ΔH_fus = Enthalpy of fusion (in kJ/mol) (energy required to melt a solid into a liquid)
  • ΔH_vap = Enthalpy of vaporization (in kJ/mol) (energy required to convert a liquid into a gas)

How to Use the Calculator

  1. Enter the Fusion Enthalpy (ΔH_fus) in the provided input box.
  2. Enter the Vaporization Enthalpy (ΔH_vap) in the second input box.
  3. Click the "Calculate Sublimation Enthalpy" button to compute the result.
  4. The calculator will display the sublimation enthalpy value in kJ/mol.

This tool is useful in thermodynamics and chemistry for understanding phase changes, particularly for sublimation processes like dry ice (solid CO₂) turning into gas directly.

Sublimation Calculation apps

Example Calculation for Sublimation Enthalpy

Let's assume we have a substance with the following enthalpies:

  • Temperature: 300 K (if required)
  • Fusion Enthalpy (ΔH_fus) = 5.0 kJ/mol
  • Vaporization Enthalpy (ΔH_vap) = 40.0 kJ/mol
Example of Sublimation Enthalpy Calculator.

Final Answer:

The sublimation enthalpy for this substance is 45.0 kJ/mol.

This means that 45.0 kJ of energy is required per mole to convert the substance directly from a solid to a gas.

FAQs

The enthalpy of sublimation for potassium (K) is approximately 89.5 kJ/mol. This value represents the energy required to convert solid potassium directly into its gaseous form without passing through the liquid phase.