Equilibrium constant (Kp) for Homogeneous Systems (A Level only) (AQA A-Level Chemistry): Quizzes

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Kp Expressions
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What does KpK_p express for gaseous reactions?

Equilibrium position via partial pressures

How does temperature affect KpK_p?

KpK_p is constant at fixed T, changes if T changes

What is the mole fraction of gas AA in a mixture?

Ratio of moles of AA to total moles

What do the mole fractions of all gases in a mixture sum to?

1

How is partial pressure pAp_A calculated from mole fraction xAx_A?

pA=xA×p_A = x_A \times total pressure

In a KpK_p expression, where are product partial pressures placed?

In the numerator

What role do stoichiometric coefficients play in KpK_p expressions?

They are powers of partial pressures

For 2A(g)+B(g)3C(g)2\text{A}(g) + \text{B}(g) \leftrightarrow 3\text{C}(g), what is KpK_p?

(pC)3(pA)2×pB\frac{(p_C)^3}{(p_A)^2 \times p_B}

What are the units of mole fraction?

No units (unitless)

Does changing overall pressure affect KpK_p at constant temperature?

No, it does not affect KpK_p

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