## General Chemistry: Principles and Modern Applications (10th Edition)

We know that, since the first reaction (1) is just the same reaction as the second one (2), but with the coefficients multiplied by 2: $$K_1 = K_2^2$$ Thus, if $K_2 \gt 1$, $K_1 \gt K_2$, but, if $K_2 \lt 1$, then $K_2 \gt K_1$.