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Question: 1 by volume the atmosphere consists of 78 n2 21...

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1) By volume, the atmosphere consists of 78% N2, 21% O2, 1%40Ar and about 400 ppm CO2

a) What is the mean molecular weight of air? Round the answer to three significant figures.

b) The total mass of the atmosphere is about 5·1018Kg. How many moles of air does it contain?

c) How many moles of O2 and CO2 are present?

d) Forests and soils contain roughly 2160 Giga ton of Carbon in the form of wood, leaves, and hummus.

Suppose that all of the world’s forests were to burn down instantaneously and that all of the soil carbon

was oxidized as well. By how much would atmospheric CO2 increase? By how much would O2 decrease?

Assume that the burning equation is the same as that for respiration and decay: CH2O+O2→CO2+H2O.

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