The thermal reaction between nitrogen dioxide and acetaldehyde in the gas phase was studied at ambient temperature and atmospheric pressure in a constant-volume batch reactor. Initial partial pressures of nitrogen dioxide varied between 0.01 and 0.03 mm, while the partial pressure of acetaldehyde ranged from 20 to 50 mm. The initial rate of disappearance of nitrogen dioxide was determined to be an order of 1.00 ± 0.03 for nitrogen dioxide and 1.00 ± 0.07 for acetaldehyde. From data for initial rates at 22.0°C, a second-order rate constant of (8.596 ± 0.189) X 1 0~3 l./(mole sec) was obtained at a total pressure of

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