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Q.

A mixture of O2 and gas "Y"' (mol. wt. 80) in the mole ratio a: b has a mean molecular weight 40. What would be 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

40

b

48

c

62

d

72

answer is D.

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Detailed Solution

Let mole fraction of O2 is x40 =32 x x +80 (1- x)or x=5/6a:b=x:(1−x)=56:16When ratio is changedMmixture=32×16+80×56=72
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