(b) Find the increase in entropy when 2 kg of oxygen at $60^{\circ} \mathrm{C}$ are mixed with 5.8 kg of nitrogen at the same temperature. The initial pressure of each gas is 100 kPa and it is equal to the pressure of the gas mixture.
Explanation
The entropy change is zero because the mixing process is isothermal and the pressure of the gas mixture is equal to the initial pressure of each gas.
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