Total Pressure Formula:
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Definition: This calculator computes the total pressure of a binary liquid system using Modified Raoult's Law, which accounts for non-ideal behavior through activity coefficients.
Purpose: Essential for dew-bubble point calculations in vapor-liquid equilibrium studies, particularly in chemical engineering and thermodynamics.
The calculator uses the formula:
Where:
Explanation: The total pressure is the sum of partial pressures of both components, each calculated as the product of mole fraction, activity coefficient, and pure component vapor pressure.
Details: Accurate pressure calculations are crucial for designing distillation columns, predicting phase behavior, and optimizing separation processes in chemical industries.
Tips: Enter mole fractions (must sum to 1), activity coefficients (typically >1 for positive deviation), and saturation pressures. Default values are provided as examples.
Q1: What is Modified Raoult's Law?
A: It extends ideal Raoult's Law by incorporating activity coefficients to account for non-ideal interactions between molecules.
Q2: When should I use this calculator?
A: For binary systems where activity coefficients are known and non-ideal behavior is significant (common with polar or associating molecules).
Q3: How do I obtain activity coefficients?
A: They can be determined experimentally or estimated using thermodynamic models like UNIQUAC or NRTL.
Q4: What if my mole fractions don't sum to 1?
A: The calculator will still compute a result, but for meaningful physical interpretation, x₁ + x₂ should equal 1.
Q5: Can this be extended to multicomponent systems?
A: Yes, the principle extends to more components by adding terms for each additional component.