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Two tanks are connected by a valve. One tank contains 2.5 kg of
nitrogen gas with the temperature and pressure of 100 °C and 80 kPa,
respectively. The other tank contains 12 kg of the same gas at 30 °C and
1200 kPa. The valve is opened and the gases are allowed to mix the
receiving energy by heat transfer to the surroundings. The final
temperature is 48 °C. Determine the final equilibrium pressure.

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