The Thermal Decomposition of Acetaldehyde, CH₃CHO → CH₄ + CO

The thermal decomposition of acetaldehyde, CH₃CHO → 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^-1
B) 0.70 mmHg • s^-1
C) 2.2 × 10^-3 /mmHg • s^-1
D) 6.7 × 10^-6 /mmHg • s^-1
E) 5.2 × 10^-5 /mmHg • s^-1