Total Pressure using Henry Law in VLE Calculator

Total Pressure Formula:

\[ P_T = \frac{x_{liquid} \times K_H}{y_{gas}} \]

Total Pressure (Pa):

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1. What is Total Pressure using Henry Law in VLE?

Definition: This calculator determines the total pressure of a gas in vapor-liquid equilibrium (VLE) using Henry's Law, which relates the concentration of a gas in a liquid to its partial pressure above the liquid.

Purpose: It helps chemical engineers and researchers calculate system pressures in equilibrium conditions for process design and analysis.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ P_T = \frac{x_{liquid} \times K_H}{y_{gas}} \]

Where:

\( P_T \) — Total pressure of the gas (Pascal)
\( x_{liquid} \) — Mole fraction of component in liquid phase
\( K_H \) — Henry's Law constant (Pa·m³/mol)
\( y_{gas} \) — Mole fraction of component in vapor phase

Explanation: The product of liquid mole fraction and Henry's constant gives the partial pressure, which when divided by vapor mole fraction gives total pressure.

3. Importance of Henry's Law in VLE

Details: Henry's Law is crucial for understanding gas solubility in liquids, designing absorption/stripping columns, and predicting gas behavior in chemical processes.

4. Using the Calculator

Tips: Enter the mole fraction in liquid phase (0-1), Henry's Law constant, and mole fraction in vapor phase (0-1). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is Henry's Law constant?
A: It's a proportionality constant that relates the concentration of a gas in solution to its partial pressure above the solution.

Q2: What are typical units for Henry's constant?
A: Common units are Pa·m³/mol, atm·L/mol, or bar·L/mol depending on the pressure units used.

Q3: When is Henry's Law applicable?
A: For dilute solutions where the solute follows ideal behavior, at relatively low pressures and temperatures.

Q4: How does temperature affect Henry's constant?
A: KH decreases with increasing temperature for most gases, meaning gases become less soluble as temperature rises.

Q5: What's the difference between Raoult's and Henry's Law?
A: Raoult's Law applies to the solvent in ideal solutions, while Henry's Law applies to the solute in dilute solutions.