For how many hours is the total mass in the atmosphere greater than 4 kg? Consider both the time prior to the discovery of the leak, and the time after the emission is stopped to come up with the total number of hours.

Applications and Investigations in Earth Science (9th Edition)
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ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
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Chapter1: The Study Of Minerals
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The methods for estimating global scale residence time for a pollutant can also be used in mass balances on a small scale. Consider a tank containing a toxic chemical that is leaking slowly into the atmosphere, emitting 1 kg per hour for 12 hours before the leak is discovered and plugged. The chemical reacts quickly once it gets into the atmosphere with a half life of 4.159 hours. For how many hours is the total mass in the atmosphere greater than 4 kg? Consider both the time prior to the discovery of the leak, and the time after the emission is stopped to come up with the total number of hours.

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