The Earth’s atmosphere has a mass of approximately 5.15 *
1015 kg. If the average molar mass of air is 28.8 g/mol,
how many moles of gas make up the atmosphere? What
is the volume of the atmosphere in liters under conditions
of STP? (Note: The average molar mass of air is the
weighted average of the molar mass of nitrogen and oxygen.
0.20132.0 g>mol2 + 0.80128.0 g>mol2 = 28.8 g>mol.)
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