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. Calculate the rate constant for the decomposition of acetaldehyde from the above data.

A) 2.2 * 10^-3/s
B) 0.70 mmHg/s
C) 2.2 * 10^-3/mmHg·s
D) 6.7 * 10^-6/mmHg·s
E) 5.2 * 10^-5/mmHg·s