Answer
C
Work Step by Step
$K_1=[HBr]^2/[H_2][Br_2]$
$K_2=[H]^2/[H_2]$
$K_3=[Br]^2/[Br_2]$
$\sqrt{K_1/(K_2.K_3)}=[HBr]/[H][Br]=K\rightarrow K=2.74\times10^{33}$
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