Recall that the equation for calculating equilibrium constants for each reaction is:
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For question 8, the overall reaction is a combination of the
forward reaction of the
first reaction and the
reverse reaction of the
second, so we have to multiply K1 by the
inverse of K2, or in otherwise
divide K1 by K2:
K
Overall = K1 x 1/K2 = K1/ K2 = 2.48 / 8.6 = 0.29 to 2 d.p.