In a system for separating gases a tank containing a mixture of hydrogen and carbon dioxide is connected to a much larger tank where the pressure is kept very low. The two tanks are separated by a porous membrane through which the molecules must effuse. If the initial partial pressures of each gas is 5.00 , what will be the mole fraction of hydrogen in the tank after the partial pressure of carbon dioxide has declined to 4.50 ?a. 52.1 %.b. 37.2 %.c. 27.4 %.d. 32.1 %.e. 4.68 %.