mass of methane
= mass of oxygen = a
number of moles of methane = a/16
number of moles of Oxygen = a/32
mole fraction of Oxygen =
=[a/32] / [{a/16} + {a/32{ ]
= [a/32] / [3a/32]
=1/32
Partial pressure of oxygen
= mole fraction Total Pressure
=1/3 P
Rate of diffusion α 1/√m
mNH3 = 17 ; mHCl = 36.5
γNH3 > γHCl
Hence white fumes first formed near hydrogen
chloride