The following equilibria were attained at 823 K:
CoO(s)+H2(g)?Co(s)+H2O(g)Kc=69
CoO(s)+CO(g)?Co(s)+CO2(g)Kc=510
Part A
Based on these equilibria, calculate the equilibrium constant for H2(g)+CO2(g)?CO(g)+H2O(g) at 823 K.
Express your answer using two significant figures