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The following calculation is based on the following assumptions: 1. The composition of air is 78% Nitrogen, 20.95% O2 and 0.93% Ar. 2. Air is an ideal gas: i.e. Obeys the equaiton PV = nRT. The mass of 1 L of air at a pressure of 1 atmosphere and at 25oC is 1.18 g.

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Q: What is the real mass for 1 liter of air?
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