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Q.

A sample of impure air contains $80 % N_{2}, 10 % O_{2}, 5 % {CO}_{2}$ and 5% Ar by volume. The average molecular weight of the sample is: $[Ar = 40]$

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a

29.8

b

none of these

c

29.4

d

30.0

answer is B.

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Detailed Solution

The average molecular shape can be calculated as;

$\frac{80 \times 28 + 10 \times 32 + 5 \times 44 + 5 \times 40}{100} = 29.8$

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A sample of impure air contains 80% N2 , 10% O2 , 5% CO2 and 5% Ar by volume. The average molecular weight of the sample is: [Ar= 40]