Activity Coefficient Formula:
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Definition: Activity Coefficient of Component 1 is a factor used in thermodynamics to account for deviations from ideal behaviour in a mixture of chemical substances.
Purpose: It helps quantify how the presence of other components affects the thermodynamic properties of component 1 in a mixture.
The calculator uses the Margules one-parameter equation:
Where:
Explanation: The activity coefficient is calculated using an exponential function of the Margules coefficient and the square of the mole fraction of component 2.
Details: Accurate activity coefficients are essential for predicting phase equilibria, designing separation processes, and modeling chemical reactions in non-ideal mixtures.
Tips: Enter the Margules coefficient (A₀) and the mole fraction of component 2 (x₂, between 0 and 1). The calculator will compute the activity coefficient of component 1.
Q1: What does the Margules coefficient represent?
A: The Margules coefficient characterizes the strength of interactions between different molecules in the mixture.
Q2: What range of values can the activity coefficient take?
A: γ₁ can be less than 1 (negative deviation from Raoult's law) or greater than 1 (positive deviation).
Q3: When would the activity coefficient equal 1?
A: When x₂ = 0 (pure component 1) or when A₀ = 0 (ideal mixture).
Q4: How is this different from two-parameter Margules equations?
A: The one-parameter version is simpler but less accurate for strongly non-ideal systems.
Q5: Can this be used for vapor-liquid equilibrium calculations?
A: Yes, activity coefficients are key components in VLE calculations for non-ideal systems.