Chemistry

Problem

Concentrations of compound

X

were measured during its conversion to products: Time (s):

0\quad 120\quad 240

[X]

(M):

0.60\quad 0.30\quad 0.15

Which of the following statements is most consistent with these data? a) The reaction is first order with

k \approx 2.5\times10^{-3}\,\text{s}^{-1}

. b) The reaction is first order with

k \approx 5.8\times10^{-3}\,\text{s}^{-1}

. c) The reaction is second order with

k \approx 1.4\times10^{-2}\,\text{M}^{-1}\,\text{s}^{-1}

. d) The reaction is zero order with

k \approx 2.1\times10^{-3}\,\text{M}\,\text{s}^{-1}