Mole Fraction Formula:
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Definition: The mole fraction (XA) is the ratio of the number of moles of component A to the total number of moles in the mixture.
Purpose: It's a way to express the concentration of a component in a mixture, particularly useful in chemical reactions and solutions.
The calculator uses the formula:
Where:
Explanation: The formula accounts for both the original moles and the dissociated portion of the substance.
Details: Mole fraction is crucial for understanding reaction stoichiometry, calculating partial pressures in gases, and determining solution properties.
Tips: Enter the number of moles (must be > 0) and degree of dissociation (between 0 and 1, default 0.35).
Q1: What does degree of dissociation mean?
A: It's the fraction of molecules that dissociate into ions or smaller molecules (0 = no dissociation, 1 = complete dissociation).
Q2: Can mole fraction be greater than 1?
A: No, mole fraction is always between 0 and 1 as it's a ratio of parts to whole.
Q3: How is this different from molarity?
A: Mole fraction is dimensionless (ratio), while molarity depends on solution volume (moles per liter).
Q4: When would I use mole fraction vs other concentration measures?
A: Mole fraction is particularly useful for gas mixtures and when temperature changes affect volume-based measures.
Q5: What if I have multiple components?
A: The sum of all mole fractions in a mixture equals 1. You would need to account for all components.