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A closed vessel contains helium and ozon...

A closed vessel contains helium and ozone at a pressure of `P` atm. The ratio of He and oxygen atoms is `1:1`. If is removed from the vessel, the pressure of the system will reduce to:

A

`0.5P` atm

B

`0.75P` atm

C

`0.25P` atm

D

`0.33P` atm

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