In simple words, mass fraction of a component in a given mixture is equal to the ratio of mass of a component to thetotal mass of mixture. Similarly, mole fraction is equal to ratio of moles of a component to the total moles of mixture. In this case, I am giving input as a mass fraction (H20) but mass fraction (H20) in post processing is showing nothing. I also gave input as a mole fraction but result is the same.nRegards,nAbbas Razan