The composition of air is approximately $80$ % $N_{2}$ and $20$ % $O_{2}$ by mass. Calculate density of air at $293 K$ and $76 c m H g$ pressure.

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Solution

$M_{a v g} = 0.8 \times 28 + .2 \times 32 = 28.8$
$d e n s i t y = \frac{P M}{R T} = \frac{28.8 \times 1}{293 \times 0.0821} = 1.197 g / L$

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density of dry air containing only N2 and O2 is 1.15 g/l at 740mm of hg and 300 k what is the % composition of N2 by mass in the air

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