# Problem: The thermal decomposition of acetaldehyde, CH3CHO → CH4 + CO, is a second-order reaction. The following data were obtained at 518°C. Time, s                     Pressure CH3CHO, mmHg 0                               364 42                             330 105                           290 720                           132 Calculate the rate constant for the decomposition of acetaldehyde from the above data. A. 2.2 x 10-3/s B. 0.70 mmHg/s C. 2.2 x 10-3/mmHg•s D. 6.7 x 10-6/mmHg•s E. 5.2 x 10-5/mmHg•s

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The thermal decomposition of acetaldehyde, CH3CHO → CH4 + CO, is a second-order reaction. The following data were obtained at 518°C.

Time, s                     Pressure CH3CHO, mmHg

0                               364

42                             330

105                           290

720                           132

Calculate the rate constant for the decomposition of acetaldehyde from the above data.

A. 2.2 x 10-3/s

B. 0.70 mmHg/s

C. 2.2 x 10-3/mmHg•s

D. 6.7 x 10-6/mmHg•s

E. 5.2 x 10-5/mmHg•s

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