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Q.

Air is a mixture of $O_{2}$ and $N_{2}$ .Air contains 80% $N_{2}$ and 20% $O_{2}$ by mole.What is the Average molecular weight of Air

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a

28.8

b

30.2

c

27.8

d

29.0

answer is A.

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Detailed Solution

$M_{a v g} = \frac{80 \times 28 + 20 \times 32}{100} = 28.8$

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Air is a mixture of O2 and N2 .Air contains 80% N2 and 20% O2 by mole.What is the Average molecular weight of Air