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For the reaction XY2(g) ⇌ XY(g) + Y(g), if the value of α (degree of dissociation) is very small compared to 1, how is α related to the pressure (P)?

1. proportional to the square root of the volume (V)
2. inversely related to the volume (V)
3. inversely related to the pressure (P)
4. inversely proportional to the square root of the pressure (P)

Correct answer: inversely proportional to the square root of the pressure (P)

Solution

For a reaction with a small degree of dissociation, the relationship between the degree of dissociation and pressure can be derived from the equilibrium expression, showing that α is inversely proportional to the square root of the pressure.

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