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

The thermal decomposition of acetaldehyde, CH₃CHO $\rarr$ CH₄ + CO, is a second-order reaction. The following data were obtained at 518°C. 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