Pressure Formula:
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Definition: This calculator determines the pressure increase in a chemical reaction system based on the equilibrium constant for partial pressure and the degree of dissociation.
Purpose: It helps chemists and chemical engineers understand how pressure changes relate to dissociation in chemical reactions.
The calculator uses the formula:
Where:
Explanation: The pressure is inversely proportional to the square of the degree of dissociation, showing how pressure increases as dissociation decreases.
Details: Understanding pressure changes is crucial for reaction vessel design, safety considerations, and predicting reaction behavior under different conditions.
Tips: Enter the equilibrium constant for partial pressure (must be > 0) and degree of dissociation (must be between 0 and 1).
Q1: What is degree of dissociation?
A: It's the fraction of reactant molecules that dissociate into products at equilibrium.
Q2: Why is pressure inversely related to dissociation?
A: As dissociation increases, more gas molecules are produced, increasing pressure unless volume expands to compensate.
Q3: What units should I use for Kp?
A: The calculator expects Kp in mol/m³, but you can convert from other units if needed.
Q4: Can I use this for any chemical reaction?
A: This specifically applies to gas-phase reactions where the stoichiometry gives the squared relationship shown.
Q5: What if my degree of dissociation is very small?
A: Very small α values will result in very large pressure values, which may indicate the reaction barely proceeds.