A gas container of fixed volume V is divided into two compartments by an impermeable fixed wall. One compartment contains ideal gas 1, the other ideal gas 2. Both sides are at pressure p and temperature T. When the wall is removed, the system reaches equilibrium. During this process, going from an initial state i to a final state f, the system is held at constant temperature T. There is no chemical interaction between the two gases. Therefore, the mixture is an ideal gas also.a) Determine the internal energy variation ΔU_if during this process.b) Show that the total entropy variation ΔS_if is given by (Fig. 8.5),

Figure 8.5

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ASit/[(N₁+N₂) R] 0.8 0.6 0.4 0.2 0 0 0.5 Concentration c, of gas 1 1