50 g of dinotrogen `(N_(2))` and 2.0 g of helium are enclosed in a vessel already containing 2.0 g of oxygen. Calculated the total pressure and the fraction of the total pressure exerted by He. The volume of the vessel is `10 cm^(3)` and the temperature is 300 K

Explanation

5.83 bar, 0.21 ltbr `n_(N_(2))=(50)/(28),n_(He)=(2)/(2),n_(O_(2))=(2)/(16)`
`thereforen_("total")=n_(N_(2))+n_(He)+n_(O_(2))`
`thereforeP=(nRT)/(V)`
or `P_(O_(2))=x_(O_(2))=1.505` bar