Consider an insulated tank with a volume V = 2 L is separated into two equal-volume parts by a thin wall. On the left is an ideal gas at P = 100kPa and T = 500K; on the right is a vacuum. Now the wall is removed. a) What is the final temperature in the tank? b) What is the ∆Suniv due to the removal of the wall?

Answer :

Answer

given,

V = 2 L

the left is an ideal gas at  P = 100 k Pa and T = 500 K

mass is constant

 [tex]m_1 = m_2[/tex]

[tex]\dfrac{P_1V_1}{RT_1} = \dfrac{P_2V_2}{RT_2}[/tex]

Pressure is same because it's not changing due to process

[tex]\dfrac{V}{500} = \dfrac{2 V}{T_2}[/tex]

[tex]T_2 = 1000\ K[/tex]

[tex]\Delta S_{univ} = \Delta S_{sys} + (\Delta S)_{surr}[/tex]

[tex]\Delta S_{univ} =m(C_v ln (\dfrac{T_2}{T_1}))+ R ln (\dfrac{V_2}{V_1})[/tex]

[tex]m = \dfrac{P_1V_1}{RT_1}[/tex]

[tex]m = \dfrac{100 \times 10^3 \times 2 \times 10^{-3}}{287\times 500}[/tex]

m = 1.39 x 10⁻³ Kg

[tex]\Delta S_{univ} =1.39\times 10^{-3}(0.718 ln\ 2+ 0.287 ln (2)[/tex]

[tex]\Delta S_{univ} =0.968\times 10^{-3}\ kJ/K[/tex]

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