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For 10 minutes each, at 0^(@)C, from two...

For 10 minutes each, at `0^(@)C`, from two identical holes nitrogen and an unknown gas are leaked into a common vessel of 4 litre capacity. The resulting pressure is 2.8 atm and the mixture contains 0.4 mole of nitrogen. What is the molar mass of unknown gas ? (Take `R = 0.821 "L-atm mol"^(-1)K^(-1)`]

A

448 g `"mol"^(-1)`

B

`224 g "mol"^(-1)`

C

226 g `"mol"^(-1)`

D

None of these

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a
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