When Acetaldehyde at a Pressure of 364 MmHg Is Introduced $\rarr$

When acetaldehyde at a pressure of 364 mmHg is introduced into an evacuated 500.mL flask at 518°C, the half-life for the second-order decomposition process, CH₃CHO $\rarr$ CH₄ + CO, is 410.s.What will the total pressure in the flask be after 1.00 hour?

A) 327 mmHg
B) 654 mmHg
C) 37 mmHg
D) 691 mmHg
E) 728 mmHg