For the reaction $2 A + B \longrightarrow D + E$,the following mechanism has been proposed: $A + B \longrightarrow C + D$ (slow) and $A + C \longrightarrow E$ (fast). Determine the rate law.
- A$r = K[A]^2[B]$
- B$r = K[A][B]$
- C$r = K[A]$
- D$r = K[A][C]$
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