1. What is K-Value in Raoult's Law?

Definition: The K-value is defined as the ratio of vapor-phase mole fraction to the liquid-phase mole fraction of a component.

Purpose: It helps in vapor-liquid equilibrium calculations and is widely used in distillation and separation processes.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( K \) — K-value (dimensionless)
• \( P_{Saturated} \) — Saturated pressure in Raoult's Law (Pa)
• \( P_{T} \) — Total pressure of gas (Pa)

Explanation: The saturated pressure of the component is divided by the total system pressure to determine the K-value.

3. Importance of K-Value Calculation

Details: K-values are fundamental in phase equilibrium calculations and are crucial for designing separation processes like distillation columns.

4. Using the Calculator

Tips: Enter the saturated pressure and total pressure in Pascals. Both values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What does a K-value greater than 1 indicate?
A: A K-value > 1 means the component is more concentrated in the vapor phase than in the liquid phase.

Q2: What's the range of typical K-values?
A: K-values typically range from 0 to 10, depending on the component and system conditions.

Q3: When is Raoult's Law applicable?
A: Raoult's Law applies to ideal solutions where intermolecular forces between different molecules are similar to those between like molecules.

Q4: How does temperature affect K-values?
A: K-values generally increase with temperature as vapor pressures increase.

Q5: What units should be used for pressure?
A: While Pascals are used here, any consistent pressure units can be used as long as both pressures are in the same units.