An open vessel containing air is heated from 300K to 400K. The fraction of air, which goes out with respect to originally present is:
PV = nRT , T1 = 300k , T2 = 400k
Since, it is an open vessel, pressure is constant and there is no change in the volume of vessel.
P1 = P2 and V1 = V2
Therefore, fraction of air that goes out