Mole Fraction Formula:
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Definition: This calculator determines the mole fraction of a component in the liquid phase based on its vapor phase mole fraction, total pressure, and Henry's Law constant.
Purpose: It's used in vapor-liquid equilibrium (VLE) calculations for dilute solutions where Henry's Law applies.
The calculator uses Henry's Law formula:
Where:
Explanation: The vapor phase mole fraction multiplied by total pressure gives the partial pressure, which when divided by Henry's constant gives the liquid phase mole fraction.
Details: This calculation is crucial for designing separation processes, understanding gas solubility, and predicting phase behavior in chemical engineering applications.
Tips: Enter the vapor phase mole fraction (0-1), total pressure in Pascals, and Henry's Law constant. Default values are provided for common conditions.
Q1: When does Henry's Law apply?
A: Henry's Law applies to dilute solutions where the solute concentration is low (typically xliquid < 0.01).
Q2: What are typical units for Henry's constant?
A: Common units are Pa·m³/mol, atm·m³/mol, or bar·m³/mol. Ensure units match your pressure units.
Q3: How do I find Henry's constant for a specific gas?
A: Henry's constants are tabulated in chemical engineering handbooks and vary with temperature.
Q4: What if my vapor mole fraction is 0?
A: Then the liquid mole fraction will also be 0 (no component present).
Q5: Does temperature affect this calculation?
A: Yes, but indirectly through Henry's constant which is temperature-dependent.