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7) The rate constant, k, for the thermal decomposition of acetaldehyde is 0.10 M-1s-1 at 500 K and 0.30 M-1s-1 at 469 K. What is the value of the energy of activation? CH3CHO (l) →CH4 (g) + CO (g) A) 32.0 kJ/mol B) -70.3 kJ/mol C) 0.693 kJ/mol D) -0.693 kJ/mol E) 70.3 kJ/mol