Atmospheric air has 78 % $N_{2}$ ; 21% $O_{2}$ ; 0.9 % Ar and 0.1 % $C O_{2}$ ,by volume. What is the molecular mass of air in the atmosphere?

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Solution

Molecular mass of air = $Σ a b u n d a n c e \times m o l e c u l a r m a s s o f c o n s t i t u e n t$
= $\frac{78 \times 28 \times + 21 \times 32 + 0.9 \times 40 + 0.1 \times 44}{100}$
=28.964 g

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