Methane gas ch4 comprises 7 x 10-5 by mass of the earths, Ask an Expert

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Methane gas (CH₄) comprises 7 x 10^-5 % by mass of the Earth's atmosphere. What is the residence time of the gas in the atmosphere if it is being lost to the methane sinks at the rate of 4 x 10¹¹ kg yr-1.

Estimated mass of the Earth's atmosphere = 5 x 10¹⁸ kg.

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