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Total Vapor Pressure Calculator by Raoult's Law

Raoult's Law Formula:

\[ P_{total} = \sum P_i \times x_i \]

Pa
Pa
Pa

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1. What is Total Vapor Pressure by Raoult's Law?

Definition: This calculator estimates the total vapor pressure of an ideal solution based on the partial pressures and mole fractions of its components.

Purpose: It helps chemists and engineers determine the vapor pressure of mixtures, important for distillation, evaporation, and other phase equilibrium calculations.

2. How Does the Calculator Work?

The calculator uses Raoult's Law formula:

\[ P_{total} = \sum P_i \times x_i \]

Where:

Explanation: The total pressure is the sum of each component's pure vapor pressure multiplied by its mole fraction in the liquid.

3. Importance of Vapor Pressure Calculation

Details: Accurate vapor pressure prediction is crucial for designing distillation systems, understanding evaporation rates, and predicting phase behavior in chemical processes.

4. Using the Calculator

Tips: Enter the vapor pressure of each pure component (in Pascals) and their mole fractions in the liquid phase. Mole fractions must sum to ≤ 1.

5. Frequently Asked Questions (FAQ)

Q1: What is Raoult's Law?
A: Raoult's Law states that the partial vapor pressure of a component in a mixture is equal to the vapor pressure of the pure component multiplied by its mole fraction.

Q2: When is Raoult's Law valid?
A: For ideal solutions where intermolecular forces between different components are similar to those between like molecules.

Q3: What if my mole fractions don't sum to 1?
A: The calculator will not compute results if the sum exceeds 1 (allowing for minor rounding). For sums < 1, it's assumed the remainder is non-volatile.

Q4: Can I add more than two components?
A: This version handles two components, but the law applies to any number of components (Ptotal = P₁x₁ + P₂x₂ + P₃x₃ + ...).

Q5: What units should I use?
A: The calculator uses Pascals (Pa) for pressure, but any consistent pressure unit will work as long as all inputs use the same unit.

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