Question

The rate law for the mechanism below is A2(g) ⇌ 2A(g)   K1, fast A(g) + B(g) ⇌...

The rate law for the mechanism below is
A2(g) ⇌ 2A(g)   K1, fast
A(g) + B(g) ⇌ AB(g)   K2, fast
AB(g) + A(g) → A2B(g)   k3, slow

Options:

rate = K2k3[A]2[B]

rate = K1K2k3 [A2][B]

rate = K10.5k3 [A2]0.5[AB]

rate = k3[A][AB]

rate = K10.5K2k3 [A2]0.5[A] [B]

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Answer #1

Rate of reaction is determined by slowest step of the reaction

As in the question third step is the slowest step

rate =k3 [A][AB]

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