Equilibrium Vapour Density Formula:
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Definition: Equilibrium vapour density is the density of a vapour substance during the stages of reaction at equilibrium.
Purpose: This calculator helps determine the equilibrium vapour density when the number of moles is 2, which is important in chemical equilibrium studies.
The calculator uses the formula:
Where:
Explanation: The initial vapour density is divided by the sum of the degree of dissociation and 1 to get the equilibrium vapour density.
Details: Understanding equilibrium vapour density is crucial for studying chemical reactions, particularly in gas-phase reactions where the number of moles changes.
Tips: Enter the initial vapour density (D) and degree of dissociation (α). The degree of dissociation must be ≥ 0.
Q1: What is the degree of dissociation?
A: The degree of dissociation is the fraction of solute molecules that dissociate into ions in solution.
Q2: Why is this specific to when number of moles is 2?
A: The formula derivation assumes the reaction involves 2 moles of product from 1 mole of reactant, which is common in many dissociation reactions.
Q3: What units are used for vapour density?
A: Vapour density is typically expressed in g/L or similar density units, relative to a standard (often hydrogen gas).
Q4: How does temperature affect the calculation?
A: Temperature affects both initial vapour density and degree of dissociation, but these should be input as measured/known values at a specific temperature.
Q5: Can this be used for any dissociation reaction?
A: This is specifically for reactions where 1 mole dissociates into 2 moles. Different stoichiometry would require a modified formula.