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Amorphous Forms of Carbon

If the compon...

Question

If the components of air are $N_{2}$ 78%, $O_{2}$ 21%, $A r$ 0.9% and $C O_{2}$ 0.1 % by volume, the molar mass of air would be (nearest integer):

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Solution

Avg molar mass of air $= \frac{(28 \times 78 + 32 \times 21 + 40 \times 0.9 + 44 \times 0.1)}{100} = 28.93$
So, nearest integer value is $29$ .

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