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A mixture of O(2) and gas "Y" ( mol. wt...

A mixture of `O_(2)` 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 )

A

40

B

48

C

62

D

72

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