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Q.

A mixture of gas X (mol. wt. 16) and gas Y (mol. wt. 28) in the mole ratio, a: b has a mean molecular weight of 20. What would be the mean molecular weight if the gases are mixed in the ratio b: a under identical conditions (gases are non reacting)?

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a

24

b

26

c

20

d

40

answer is A.

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Detailed Solution

Now, calculate the mean molecular mass when the mixture of gas X (mol. wt. 16) and gas Y (mol. wt. 28) is in the mole ratio:

Thus,

a×16+b×28a+b=20

⇒a=2b

⇒ b×16+a×28a+b⇒ M=24

The mean molecular weight if the gases are mixed in the ratio b: a is 24.

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