Equal weights of methane and hydrogen are mixed in an empty container at 25ºC. The fraction of the total pressure exerted by hydrogen is

Let x gram of both gases are added. Number of moles for hydrogen = given mass/ molecular mass = x/2 Number of moles for methane = given mass/ molecular mass = x/16 Mole fraction for hydrogen = ( / 2) / ( / 2 /16) x x x =8/9. Partial pressure of hydrogen/ Total pressure = mole fraction of hydrogen = 8/9.