A reaction proceeds by the mechanism shown below. Steps 1 and 2 are rapid and reversible; Step 3 is slow.
Step 1 A + B ⇌ C K₁ = 4.0
Step 2 C ⇌ D + B K₂ = 0.50
Step 3 D → products kₛ = 1.2 × 10⁻³ s⁻¹
Initially [A] = 0.20 M and [B] = 0.10 M. Which value is closest to the initial rate of product formation?
a) 4.8×10−4Ms−1
b) 1.0×10−4Ms−1
c) 2.4×10−4Ms−1
d) 9.6×10−4Ms−1