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Consider the reaction 2 KClO3 (s) ⇌ KCl (s) + 3 O2 (g) at 500 K. At equilibrium, PO2 = 0.20 atm. What is the Kc? a. 8.0x10-3 b. 550 c. 1.2x10-7 d. 125 e. impossible to determine