please solve it ..
lone rctag ula r duct the air Flo ιν inside ito L-4m、w...
lone rctag ula r duct the air Flo ιν inside ito L-4m、w 0.4 inlet concentration oFethanc) is homogenous and mol and the out ,et a, n ent rutlon i τ乙ero , the di fass irity is ,35 x/o-Sny Findthe concentration at x=o