Equal weights of ethane 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 ethane = given mass/ molecular mass = x/30 Mole fraction for hydrogen = ( / 2) / ( / 2 / 30) x x x =15/16. Partial pressure of hydrogen/ Total pressure= mole fraction of hydrogen=15/16