Answer
$$K_c = 2.50 \times 10^{-29}$$
Work Step by Step
1. The coefficients are half as big (divided by 2). Therefore:
$$K_{c2} = (K_{c1})^{1/2} = (6.25 \times 10^{-58})^{1/2} = 2.50 \times 10^{-29}$$
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