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Equal masses of methane and oxygen are mixed in an empty container at 25^(@)C. The fraction of total pressure exerted by oxygen is

Answer»

`(1)/( 3) XX ( 273)/( 298) `
`(1)/( 3)`
`(1)/(2)`
`(2)/(3)`

Solution :Let the mass of METHANE and oxygen be x g each.
Moles of `CH_(4) = ( x )/( 16)`
Moles of `O_(2) = ( x )/( 32)`
TOTAL moles `= ( x )/( 16) + ( x)/( 32) = ( 3x )/( 32)`
`p_(O_(2)) = p_("total")xx x_(O_(2))`
`( p_(O_(2)))/( p_("total")) = x_(2)= ((x)/( 32))/( (3x)/(32)) = ( 1)/( 3)`


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