If 240mL of a gas X diffuses through a porous membrane in 20 min whereas the same volume of methane diffuses in 10 min at the same temperature and pressure, the molar mass in g mol^(-1) of gas X is

If 240mL of a gas X diffuses through a porous membrane in 20 min where

1.	If 240mL of a gas X diffuses through a porous membrane in 20 min whereas the same volume of methane diffuses in 10 min at the same temperature and pressure, the molar mass in g mol^(-1) of gas X is
Answer» 128 8 64 32 Answer :C