Vapour Phase Mole Fraction Formula:
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Definition: This calculator determines the mole fraction of a component in the vapour phase using Modified Raoult's Law, which accounts for non-ideal behavior in liquid mixtures.
Purpose: It's essential for vapor-liquid equilibrium (VLE) calculations in chemical engineering and thermodynamics.
The calculator uses the formula:
Where:
Explanation: The formula modifies Raoult's Law by including the activity coefficient to account for deviations from ideal behavior.
Details: Accurate calculation is crucial for designing distillation columns, flash drums, and other separation processes in chemical industries.
Tips:
Q1: What is the activity coefficient?
A: It's a factor that accounts for deviations from ideal solution behavior. γ=1 for ideal solutions, >1 for positive deviations, and <1 for negative deviations.
Q2: When should I use Modified Raoult's Law?
A: Use it for non-ideal liquid mixtures. For ideal mixtures, use standard Raoult's Law (γ=1).
Q3: How do I find the activity coefficient?
A: It can be determined experimentally or calculated using models like Wilson, NRTL, or UNIQUAC equations.
Q4: What if my total pressure is less than saturated pressure?
A: The component would exist as a superheated vapor, and this calculation wouldn't apply.
Q5: Can I use different pressure units?
A: Yes, but ensure all pressure values use the same units for consistent results.