Question

What is the equilibrium constant expression for the reaction

P4 (s) + 5O2 (g) P4 O10 (s) ?

• A. KC = [P4O10]/[P4] [O2]5
• B. KC = 1/[O2]5
• C. KC = [O2]5
• D. KC = [P4O10]/5[P4] [O2]

Answer 1

Answer: (B)

KC = 1/$O2$5

Answer 2

P4(g) + 5O2 (g) $\rightleftharpoons$ P4O10(g)

$K_{C} = \frac{\left\lbrack P_{4}O_{10}(s) \right\rbrack}{\left\lbrack P_{4}(s) \right\rbrack\left\lbrack O_{2}(g) \right\rbrack^{5}}$