1. What is Pressure using K-value Expression for Raoult's Law?

Definition: This calculator determines the total pressure of a gas using Raoult's Law and the K-value expression.

Purpose: It helps chemical engineers and researchers calculate gas pressure in vapor-liquid equilibrium systems.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( P_T \) — Total pressure of gas (Pascal)
• \( P_{Saturated} \) — Saturated pressure in Raoult's Law (Pascal)
• \( K \) — K-value (ratio of vapor-phase to liquid-phase mole fraction)

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

3. Importance of Pressure Calculation

Details: Accurate pressure calculation is essential for designing distillation columns, vapor-liquid equilibrium studies, and chemical process simulations.

4. Using the Calculator

Tips: Enter the saturated pressure in Pascals and the K-value (default 0.85). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is the K-value in Raoult's Law?
A: The K-value is the ratio of vapor-phase mole fraction to liquid-phase mole fraction of a component.

Q2: What's a typical K-value range?
A: K-values typically range from 0.5 to 2.0, depending on the component and system conditions.

Q3: How do I find the saturated pressure?
A: Saturated pressure can be found in chemical engineering handbooks or calculated using Antoine equation.

Q4: Does this calculator work for ideal systems only?
A: This calculation assumes ideal behavior. For non-ideal systems, activity coefficients should be considered.

Q5: What units should I use for pressure?
A: The calculator uses Pascals (Pa), but you can convert from other units before entering values.