A 4.0 dm3 flask containing N2 at 4.0 bar was connected to a 6.0 dm3 flask containing helium at 6.0 bar, and the gases were allowed to mix isothermally. Then, the total pressure of the resulting rnixture will be. (Kerala CEE 2008)

Applying Bolye’s law, (since, the temerpature remains constant i.e., isothermal) 2 2 2 2 ' ' (after mixing) (before mixing) N N N N p V p V 2 2 2 2 ' ' 4 4.0 16 1.6 10 10 N N N N p V p bar V x Similarly, for He, ' ' (after mixing) = p (before mixing) He He He He p V V 2 ' ' 6 6 36 3.6 10 10 x He He He pV p bar V Total pressure of mixture = 1.6 + 3.6 = 5.2 bar