The reactions shown here can be combined to make the overall reaction C(s) + H2O(g) ⇌CO(g) + H2(g) by reversing some and

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The reactions shown here can be combined to make the overall
reaction
C(s) + H2O(g) ⇌CO(g) + H2(g) by reversing some and/or dividing all
the coefficients by a number.
a. C(s) + O2(g) → CO2(g)
K=1.363×1069
b. 2 H2(g) + O2(g) → 2 H2O(g)
K=1.389×1080
c. 2CO(g) + O2(g) → 2 CO2(g)
K=1.477×1090
Determine the value of KK.
Express your answer to four significant figures.
K=___________