Equilibrium

Equilibrium

Question

What is the equilibrium expression for the reaction P4(s) +5O2(g)⇌ P4O10(s)? 

  • Kc = [P4O10] / P4] [O2]5

  • Kc = 1/[O2]5

  • Kc = [O2] 5

  • Kc = [P4O10] / 5[P4][O2]

Answer

B.

Kc = 1/[O2]5

In the expression for equilibrium constant (Kp or Kc) species  state are not written (i.e., their molar concentrations are not taken as 1)
P4 (s) + 5O2 (g) ⇌ P4O10 (s)
Thus, Kc = 1/[O2]5

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