Two closed bulbs of equal volume (V) containing an ideal gas initially at pressure pi and temperature T1 are connected through a narrow tube of negligible volume as shown in the figure below. The temperature of one of the bulbs is then raised to T2. The final pressure pf is:
B.

Initially,
Number of moles of gases in each container =
Total number of moles of gases in both containers
=
After mixing, number of moles in left chamber
=
Number of moles in right chamber =
Total number of moles
=
As the total number of moles remains constant.
Hence,