55. Thermal decomposition of acetaldehyde at 518 C in the gas phase proceeds according to the equation: 2CH3CHO → 2CH4 2CO. The initial pressure of the system is 363 mm. rt. Art. Prove that the reaction is a 2nd order reaction if it is known:
t, s 42 105 300 450
P (mm, Hg) CH3CHO 329 289 211 174

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