The Thermal Decomposition of Acetaldehyde, CH₃CHO $\rarr$ CH₄ + CO, Is a Second-Order Reaction

Multiple Choice

The thermal decomposition of acetaldehyde, CH₃CHO $\rarr$ CH₄ + CO, is a second-order reaction. The following data were obtained at 518 ^$\circ$ C. $\begin{array}{cc}\text { Time, } \mathrm{s} & \text { Pressure } \mathrm{CH}_{3} \mathrm{CHO}, \mathrm{mmHg} \\\hline0 & 364 \\42 & 330 \\105 & 290 \\720 & 132\end{array}$ Based on the data given, what is the half-life for the disappearance of acetaldehyde

A) 1.5 * 10⁵ s
B) 410 s
C) 5.4 * 10⁷ s
D) 520 s
E) 305 s