What is the equilibrium expression for the reaction P4 (s) + 5O2 $\leftrightharpoons$ P4O10 (s)?

Question

What is the equilibrium expression for the reaction
P₄ (s) + 5O₂ $\leftrightharpoons$ P₄O₁₀ (s)?

K_c = [P₄O₁₀] / 5[P₄] [O₂]

K_c = 1/[O₂]⁵

K_c = [P₄O₁₀] / [P₄] [O₂]⁵

K_c = [O₂]⁵

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