Answer
$2.25\times10^{22}$
Work Step by Step
$K_2=[CO_2]^2/[CO]^2[O_2]=([CO][O_2]^{1/2}/[CO_2])^{-2}=K_1^{-2}$
$K_2=(6.66\times10^{-12})^{-2}=2.25\times10^{22}$
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