Answer
$2.6\times10^{-9} M$
Work Step by Step
$K_{c} = \frac{[Br_{2}][F_{2}]^{5}}{[BrF_{5}]^{2}} = \frac{(0.0018)(0.0090)^{5}}{(0.0064)^{2}} = 2.6\times10^{-9} M$
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