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

Multiple Choice

When acetaldehyde at a pressure of 364 mmHg is introduced into an evacuated 500. mL flask at 518 ^$\circ$ 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