Chemistry

Chemistry

Problem

For the reaction X+Y→productsX + Y \rightarrow \text{products}, initial-rate data were collected at 25 °C: Run 1: [X] = 0.10 M, [Y] = 0.10 M, initial rate = 2.0×10−32.0\times10^{-3} M s−1^{-1} Run 2: [X] = 0.20 M, [Y] = 0.10 M, initial rate = 4.0×10−34.0\times10^{-3} M s−1^{-1} Run 3: [X] = 0.20 M, [Y] = 0.30 M, initial rate = 1.2×10−21.2\times10^{-2} M s−1^{-1} Which mechanism below is most consistent with these data? a) Step 1 (slow): X+X→ZX + X \rightarrow Z Step 2 (fast): Z+Y→productsZ + Y \rightarrow \text{products} b) Step 1 (slow): X→ZX \rightarrow Z Step 2 (fast): Z+Y→productsZ + Y \rightarrow \text{products} c) Step 1 (slow): X+Y→ZX + Y \rightarrow Z Step 2 (fast): Z→productsZ \rightarrow \text{products} d) Step 1 (slow): X+2Y→ZX + 2Y \rightarrow Z Step 2 (fast): Z→productsZ \rightarrow \text{products}

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