The following kinetic data were obtained for the non-stoichiometric reaction at . Exp 1: . Exp 2: . — Chemical Kinetics Chemistry Question
Question
The following kinetic data were obtained for the non-stoichiometric reaction $2A + B \rightarrow C + D$ at $298 \text{ K}$. Exp 1: $[A]=0.05 \text{ M}, [B]=0.05 \text{ M}, \text{Rate}=1.2 \times 10^{-3} \text{ M s}^{-1}$. Exp 2: $[A]=0.10 \text{ M}, [B]=0.05 \text{ M}, \text{Rate}=2.4 \times 10^{-3} \text{ M s}^{-1}$. Exp 3: $[A]=0.05 \text{ M}, [B]=0.10 \text{ M}, \text{Rate}=1.2 \times 10^{-3} \text{ M s}^{-1}$. The order of the reaction with respect to A and B is respectively:
Answer: B
💡 Solution & Explanation
From Exp 1 and 2: keeping $[B]$ constant, doubling $[A]$ causes the rate to double ($1.2$ to $2.4$). Thus, order wrt $A = 1$. From Exp 1 and 3: keeping $[A]$ constant, doubling $[B]$ causes the rate to remain unchanged. Thus, order wrt $B = 0$.
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