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Calculate the total pressure in a 10 L ...

Calculate the total pressure in a 10 L cylinder which contains `0.4` g helium ,1.6 of oxygen and 1.4 g nitrogen at `27^(@)C`. Also calculate the partial of helium gas in the cylinder. Assume ideal hehaviour for gases.

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Total number of moles `=(0*4)/(4)+(1*6)/(32)+(1*4)/(28)=0.1+05+0*05=0*2` moles.
`pV=nRT`
`pxx10L=0*2xx0*82xx300rArr p=(24*6xx0*2)/(10)`
`p=0*492 atm`
`P_(He)(0.1)/(0.2)xx0*492=0*246` atm
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