Two tanks (A and B) are connected together by a small pipe which contains a valve.

Initially the valve is closed and tank A, which has a volume of 1 m3 contains air

at a pressure of 6 atm and a temperature of 60C. Tank B contains a mixture of

nitrogen and oxygen (95 mol% N2) at 12 atm pressure and 90C .

The valve is then opened and the contents of the two tanks mix. After complete

mixing has taken place, the mixed gas contains 85 mol% N2. Calculate the volume

of tank B.

Consider that air contains 79 mol% nitrogen and 21 mol% oxygen and that the

volume of any gas at 273 K and 1 atm is 22.414 m3 kmol��1 - alternatively, 1 atm

= 101.325 kPa, R = 8.3143 kJ kmol��1 K��1.