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Theophylline is a pharmaceutical drug that is sometimes used to help with lung function. You observe a case where the initial lab results indicate that the concentration of theophylline in a patient's body decreased from 1.2 x 10^-3 M to 6.0 x 10^-4 M in 24 hours. In another 12 hours the drug concentration was found to be 3.0 x 10^-4 M. What is the value of the rate constant for the metabolism of this drug in the body.