40 cm3 of hydrogen takes 15 minutes to diffuse out of a vessel. Calculate the time in which 25 cm3 of nitrogen would diffuse through the vessel under similar conditions

For H2 :Volume, VH2=40cm3;    time ,tH2= 15 minutes ;    MH2=2 For N2 :Volume VN2=25cm3,    time, t2= ?  MN2= 28 But rH2rN2=VH2tH2×tN2VN2=MH2MN21/240× tN215×25 =  2821/2(14)1/2=3.74t2=3.74×15×2540=35min