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SO2 and He gases present in 2:1 molar ra...

`SO_2` and He gases present in `2:1` molar ratio in a closed vessel are allowed to diffuse. The average molar mass of the initially effused gaseous mixture is

A

`40 gmol^(-1)`

B

`40/7 g mol^(-1)`

C

`24 g mol^(-1)`

D

`24/7 g mol^(-1)`

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