A container has two chambers of volumes V 1 = 2 litres and V 2 = 3 litres separated by a partition made of a thermal insulator. The chambers contain n 1 = 5 and n 2 = 4 moles of ideal gas at pressures p 1 = 1 atm and p 2 = 2 atm, respectively. When the partition is removed, the mixture attains an equilibrium pressure of

1. A. 1.8 atm
2. B. 1.3 atm
3. C. 1.6 atm
4. D. 1.4 atm

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